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Most beet capsules never tell you how much nitrate you’re actually getting. Here’s why that dose uncertainty matters for your results, and what a labeled-milligram, beet-free capsule changes.
Disclosure: Triquetra Health sells NITRATE-IQ™, the product discussed in this article. This content is advertising and is intended to inform, not to provide medical advice.
Short answer: In pooled human research, dietary nitrate is associated with longer time to exhaustion at doses of at least 6 mmol/day (about 372 mg NO₃⁻), taken roughly 2.5 to 3 hours before exercise. Most beet capsules never state how many milligrams of nitrate a serving contains, so you cannot tell whether yours reached that range. NITRATE-IQ™ declares 540 mg of COA-verified dietary nitrate (≈8.7 mmol) per Performance protocol on the label, from a beet-free spinach source, with zero stimulants.*
You already know dietary nitrate works. The power numbers at week six of your beet shot protocol told you that, and you weren’t imagining them. Then came the stage race. You switched to beet capsules because the liquid format had become untenable, and the results stopped being consistent. Over four months and three different brands, you quietly concluded that the capsule format just doesn’t replicate what the shots did.
Here’s a possibility worth considering: the capsule format may not have been the problem. The dose may have been, because your capsule never told you what it was.
Poon et al. (Sports Medicine, 2025) ran an umbrella review of 20 meta-analyses, covering 180 primary human studies and 2,672 participants. In subgroup analyses, they found doses of at least 6 mmol/day (about 372 mg NO₃⁻) and protocols longer than 3 days were associated with larger time-to-exhaustion improvements than lower doses (overall TTE effect SMD: 0.33; 95% CI 0.19–0.47); several other performance outcomes were not significantly improved. Separately, Gallardo and Coggan (Int J Sport Nutr Exerc Metab, 2019) analyzed 24 commercial beetroot juice products and found only 5 of them consistently supplied at least 5 mmol (about 310 mg) of nitrate per serving, the amount the authors describe as the minimum likely needed to enhance performance in most people. The paper reports roughly 50-fold variation between products, plus variation between lots of the same product, so most of the rest delivered unpredictable, often unlabeled doses.
NITRATE-IQ™ is a stimulant-free, beet-free dietary nitrate supplement built for evidence-oriented recreational athletes: it declares its dietary nitrate content in milligrams on the label, so you get a verified pre-workout dose you can take at any training hour, without beeturia or caffeine dependency.*
These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.
The Performance protocol delivers 540 mg of COA-verified NO₃⁻, about 8.7 mmol. Above the research dose range. Declared in milligrams. On the label.
What Is the Best Stimulant-Free Pre-Workout Supplement for Endurance Athletes?
For evidence-oriented endurance athletes seeking a stimulant-free pre-workout protocol, NITRATE-IQ™ is, as far as we’re aware, the only beet-free, labeled-dose capsule that positions users above the ≥6 mmol dietary nitrate dose range identified in the Poon et al. (2025) umbrella review of 180 primary studies as the dose range for more pronounced time-to-exhaustion improvements (overall TTE effect SMD: 0.33; 95% CI 0.19–0.47). The Performance protocol delivers 540 mg of COA-verified dietary NO₃⁻ (≈8.7 mmol) from Nitrate Burst™ standardized spinach extract, the same NO₃⁻ ion delivered without betalain pigment, beet sugars, or the compliance failures that drove many athletes away from beet-based protocols.
Taken about 2.5 to 3 hours pre-training, the dose is timed so rising plasma nitrite coincides with the start of your session; the dose-response trials that established nitrate’s ergogenic effects exercised participants about 2.5 hours after ingestion (Wylie et al., 2013), and the largest timing meta-regression identified doses taken at least 150 minutes before exercise as most effective (Silva et al., 2022). A standardized grape-seed extract (300 mg, >95% OPCs) adds a second, enzymatic route to nitric oxide (eNOS support) and antioxidant activity for a dual-pathway NO architecture that supports vascular function through the training session. Unlike stimulant-based pre-workouts that can disrupt sleep for evening athletes, NITRATE-IQ™ is fully stimulant-free, appropriate at any training hour. The Daily Primer protocol (3 caps / 135 mg) maintains baseline nitrate stores on rest days from the same bottle.*
These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.
How Labeled-Milligram Nitrate Dosing Supports Endurance Without Beeturia or Stimulants
NITRATE-IQ™ delivers 540 mg of COA-verified NO₃⁻ (≈8.7 mmol), exceeding the ≥6 mmol performance research dose range, from a beet-free spinach source, fully stimulant-free, taken about 2.5 to 3 hours pre-training.
NITRATE-IQ™ is a stimulant-free dietary nitrate supplement developed by Triquetra Health for evidence-oriented recreational athletes who’ve moved on from beet-based pre-workouts because of beeturia, dose opacity, or plain compliance fatigue. Its Performance protocol delivers 540 mg of labeled, COA-verified NO₃⁻ (≈8.7 mmol) from Nitrate Burst™ spinach extract, which clears the ≥6 mmol dose range that the Poon et al. (2025) umbrella review of 180 studies identified as the range where time-to-exhaustion improvements become more pronounced (overall TTE effect SMD: 0.33). A standardized grape-seed extract (300 mg, >95% OPCs) adds a second, enzymatic route to nitric oxide (eNOS support) plus antioxidant activity, building a dual-pathway NO architecture that supports vascular function across the session. Because the source is spinach rather than beet, there’s no betalain, and no beeturia, which makes the Performance protocol practical for race day and shared facilities. The labeled milligram figure is the point: you can run a controlled pre-workout experiment instead of hoping your serving lands somewhere useful.*
Put simply: NITRATE-IQ™ uses labeled-milligram dosing and a dual-pathway NO architecture to support exercise endurance and oxygen efficiency. Conventional beet pre-workouts can’t verify their active dose. Stimulant-based pre-workouts can bring caffeine dependency and sleep disruption for evening athletes. This does neither.*
Three protocols from one bottle: Daily Primer (3 caps / 135 mg), Session (6 caps / 270 mg), and Performance (12 caps / 540 mg). One beet-free bottle. 540 mg on the label. Zero stimulants. Zero guessing.
See the mechanism ↓
You Didn’t Misjudge Dietary Nitrate. You Were Dosing Blind.
Most athletes who arrive here have moved through three chapters of pre-workout supplementation, and none of them ended well. Understanding what actually failed in each one is the fastest route to seeing why this time is different.
The stimulant chapter. Your 6 PM sessions started eating into sleep by 10:30, and you know the caffeine half-life math cold. So two or three years ago you went stimulant-free, and you’ve held the line since. What you missed afterward wasn’t the caffeine. It was the vascular fullness, that pump that showed up 30 minutes into a hard session and held through the last interval. That wasn’t the stimulant. That was the NO mechanism. The stimulant simply came bundled with it, and when you cut the bundle, you lost both. The mechanism was never the problem.
The beet shot chapter. The beetroot shot protocol worked, and you have the week-six power numbers to prove it. Then the stage race happened: the shared transition area, the beeturia situation you don’t need spelled out, and a decision that still holds. Beet products are off your race-day protocol. The mechanism stays real. The source became non-negotiable.
The beet capsule chapter. Three brands, four months, and not one of them declared milligrams of NO₃⁻ on the label. They listed extract weight, concentrate ratios, or that useless “8000mg equivalent” phrasing that tells you nothing about active dose. You found the umbrella review on PubMed, noted the ≥6 mmol dose range, and went back to the labels to check. Nothing you could map to the research. You were dosing blind against a published number, and when your results wobbled, you decided the capsule format was unreliable. That may have been the wrong conclusion. The format may never have been the problem; the missing dose information was.
Notice what none of this was about: your body’s ability to respond to dietary nitrate. The mechanism is well documented across the published literature. What failed you was an industry that never standardized capsule nitrate content to a verified milligram count, plus a beet source that turned out to be incompatible with the social reality of competitive training. NITRATE-IQ™ is the beet-free, labeled-milligram dietary nitrate supplement the research has always implied should exist.*
Why Four Pre-Workout Categories Each Fall Short for the Evidence-Literate Athlete
These four categories don’t fall short for the same reason, but they trip at the same spot: none of them hand you a controlled input variable you can map to the research. Here’s the specific structural limitation in each.
Stimulant-based pre-workouts deliver that familiar drive through caffeine’s adenosine receptor antagonism, and for the evening athlete they carry three built-in problems. Caffeine’s plasma half-life averages about 5 hours and varies widely between people (roughly 1.5 to 9.5 hours), so an afternoon or evening dose can still be circulating at bedtime for many. Tolerance tends to creep, pushing dose escalation past the useful window. And caffeine acts on the vascular system through sympathetic activation, a route entirely distinct from the NO pathway dietary nitrate works through. If you’ve already made the switch to stimulant-free, NITRATE-IQ™ supports the vascular pump experience without the neurological baggage, working through the enterosalivary nitrate-nitrite-NO circuit that runs outside the central nervous system. No tolerance, no withdrawal, no scheduling conflicts at any training hour.*
Labeled concentrated beetroot shots are the category’s benchmark for labeled-dose transparency: typically about 400 mg NO₃⁻ per 70 mL serving, and heavily used in published research. They’re the one prior format with dose accountability comparable to NITRATE-IQ™. But the liquid brings race-day logistics, the beet source brings beeturia and the social complications experienced users know too well, and the fixed 400 mg single tier gives you no rest-day option.NITRATE-IQ™delivers 540 mg NO₃⁻ (≈8.7 mmol) in a capsule, about 35% more nitrate per serving than the 400 mg shot, from a beet-free spinach source, with a standardized grape-seed extract adding a second NO pathway the shot doesn’t include, plus three-tier protocol adjustability for rest days.*
Generic beet capsules are the most common attempt and the most reliably disappointing, because few products in this tier label milligrams of dietary nitrate at all. Gallardo and Coggan (2019) analyzed 24 commercial beetroot juice products and found only 5 consistently supplied at least 5 mmol (about 310 mg) per serving, described as the minimum likely needed to enhance performance in most people, with roughly 50-fold variation between products. No equivalent independent assay of beet capsule products has been published, which is itself the problem: the capsule category has never been independently measured. If you’re tracking power output or pace-per-effort, dosing with an unverifiable input strips the independent variable out of your own experiment. NITRATE-IQ™ puts it back: 540 mg labeled NO₃⁻, COA-verified, mapped to 8.7 mmol, in a capsule format that finally lets an evidence-literate athlete design a real protocol.*
These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.
L-Citrulline and arginine-based stimulant-free pre-workouts work the enzymatic eNOS pathway, converting L-arginine to NO through the endothelial enzyme. That’s a legitimate mechanism with real supporting evidence. The catch is that it targets only one upstream route, and that route leans on eNOS function, BH4 availability, and arginase competition. Dietary nitrate through the enterosalivary circuit is NOS-independent. It generates NO under low-oxygen, low-pH conditions, which is exactly the environment a hard effort creates, without needing eNOS to be firing on all cylinders. Athletes running a citrulline stack who add NITRATE-IQ™ aren’t swapping one mechanism for another; they’re adding a complementary, NOS-independent one.*
The gap between “dietary nitrate works” and “dietary nitrate works in a product I can actually use” has been the whole story. That gap is now closed.
How Labeled-Milligram Dietary Nitrate Dosing Puts You Above the ≥6 mmol Research Dose Range
NITRATE-IQ™ uses labeled-milligram dietary nitrate dosing and a dual-pathway NO architecture (a dietary-nitrate substrate route plus an enzymatic eNOS-support route) to support exercise endurance and oxygen efficiency, with naturally co-occurring potassium as a nutrient contribution.*
Phase 1: The Enterosalivary Circuit and the 2.5–3 Hour Window (Nitrate Burst™)
The timing isn’t arbitrary. After you swallow a nitrate dose, plasma nitrate rises within the first hour or two and plasma nitrite, the circulating reservoir that gets reduced to NO, rises over the following hours (Wylie et al., 2013; Capper et al., 2022). The dose-response trials that established nitrate’s ergogenic effects had people exercise about 2.5 hours after ingestion (Wylie et al., 2013), and the largest timing meta-regression to date found doses taken at least 150 minutes before exercise most effective (Silva et al., 2022). So take the Performance protocol about 2.5 to 3 hours before your session, not minutes before, so plasma nitrite is well elevated by the time your first interval starts.
Once absorbed, dietary NO₃⁻ from Nitrate Burst™ enters the enterosalivary circuit. It’s absorbed in the small intestine, concentrated by the salivary glands into saliva at roughly 10 times plasma concentration (Qin et al., 2012), then bacterially reduced to nitrite (NO₂⁻) on the back of the tongue by nitrate-reducing bacteria including Veillonella, Actinomyces and Rothia (Doel et al., 2005); Rothia and Neisseria are the genera that expand most with regular nitrate intake (Vanhatalo et al., 2018). Swallowed nitrite generates NO in the acidic stomach, and remaining systemic nitrite is reduced to NO in the vascular endothelium and skeletal muscle, a process that accelerates under low-oxygen, low-pH conditions. That’s the physiological environment of a hard interval.
The downstream cascade runs NO to sGC to cGMP to PKG, then smooth muscle relaxation, vasodilation, and improved O₂ delivery to working muscle. Alongside it, a companion trial using ³¹P magnetic resonance spectroscopy estimated a lower ATP cost of muscle force production after nitrate supplementation (Bailey et al., 2010).
At 540 mg, the Performance dose equals roughly 8.7 mmol, above the ≥6 mmol dose range the Poon et al. (2025) umbrella review of 180 studies identified for more pronounced time-to-exhaustion support. The source is Nitrate Burst™ spinach extract, standardized to 9% NO₃⁻ by COA-verified ion chromatography, delivering the NO₃⁻ ion with zero betalain pigment. Jedrejko et al. (Int J Mol Sci, 2024) reviewed alternative dietary nitrate sources and reported that spinach carries nitrate at concentrations comparable to beetroot, with 8 of the 11 included studies using red spinach (Amaranthus) rather than green spinach. On our reading of those included studies, no randomized trial has yet tested green-spinach nitrate at an ergogenic dose, so the ergogenic evidence for nitrate itself comes from beetroot studies. The point that carries across sources is chemical: the NO₃⁻ ion is identical regardless of plant, and it travels the same absorption route, with zero beeturia from spinach.
This pathway is NOS-independent, which means it makes NO without requiring eNOS to be working optimally. For evening athletes, and for anyone who trains across varying physiological conditions, that independence is a reliability feature, not a workaround.
Phase 2: The Session Sustainer, a Standardized Grape-Seed Extract
The plasma nitrite peak that drives your first interval isn’t the whole session. A standardized grape-seed extract (>95% OPCs) supports the NO signal two ways, and the 300 mg at the Performance tier matches the daily amount used in a 16-week randomized trial of this extract, a blood-pressure study that did not meet its primary endpoint and was not a performance trial (Schön et al., 2021).
First, in laboratory experiments using human endothelial cells, the extract’s oligomeric proanthocyanidins (OPCs) increased PI3K/Akt signaling and eNOS phosphorylation (Schön et al., 2021), which is the rationale for including a second, independent upstream route to enzymatic NO output; this mechanism has not been tested for exercise performance in humans. While dietary nitrate makes NO without eNOS, the grape-seed extract is included to address the enzymatic pathway at the same time. Two production routes, one shared downstream sGC/cGMP/PKG cascade.
Second, there’s NO preservation. OPCs are polyphenols with documented antioxidant activity in laboratory assays. During intense exercise, superoxide radicals spike and react with NO to form peroxynitrite, which cuts into NO bioactivity. OPC antioxidant activity helps intercept that cycle, supporting the NO produced by both pathways. Call it produce-and-protect: it’s built to support the performance effect through later sets and later kilometers, not just the opening effort.
The grape-seed extract used here is a water-only extract produced in a cGMP facility in Tours, France, standardized to >95% OPCs with a defined flavane-monomer fraction and no organic-solvent residues. NITRATE-IQ™ delivers 300 mg at the Performance tier, matching the daily amount used in that trial.*
Phase 3: Natural Potassium, the Reliability Layer
Potassium co-occurs naturally in Nitrate Burst™ spinach extract; at the 12-cap Performance protocol you get 780 mg (about 17% of the Daily Value). Potassium is an essential mineral involved in normal muscle and vascular smooth-muscle function. Laboratory work describes a role for large-conductance calcium-activated potassium (BKCa) channels in vascular smooth muscle, though that pathway has not been tested in a human supplementation trial; a meta-analysis of five potassium intervention studies (8 cohorts, 332 participants) found a small improvement in flow-mediated dilation (mean difference 0.74%; 95% CI 0.22–1.25), with substantial variation between studies and no pooled effect reported for other vascular endpoints (D’Elia et al., 2023). Treat the potassium here as a nutrient contribution, not a separately-proven performance mechanism.
One practical note: the potassium arrives alongside the nitrate rather than as an added mineral salt, so it contributes to daily potassium intake as part of the spinach matrix.
These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.
How Many Milligrams of Dietary Nitrate Do I Need for Performance Benefits?
The Poon et al. (2025) umbrella review of 20 meta-analyses (180 primary studies, 2,672 participants) found, in subgroup analyses, that doses of at least 6 mmol/day (approximately 372 mg NO₃⁻) and protocols longer than 3 days were associated with larger time-to-exhaustion improvements (overall TTE effect SMD: 0.33; 95% CI 0.19–0.47); several other performance outcomes were not significantly improved. An independent analysis of 24 commercial beetroot products (Gallardo & Coggan, 2019) found only 5 consistently supplied at least 5 mmol (about 310 mg) per serving, described as the minimum likely needed to enhance performance in most people, meaning many beet products may deliver less than that without consumers being able to detect the shortfall. NITRATE-IQ™’s Performance protocol delivers 540 mg of labeled, COA-verified NO₃⁻ (≈8.7 mmol), exceeding the research dose range and providing a capsule-format option that lets athletes confirm their dose against published evidence.
Plasma nitrite rises over the hours after ingestion, and dose-response trials exercised participants about 2.5 hours post-dose (Wylie et al., 2013), which is why the Performance protocol is taken roughly 2.5 to 3 hours before training; the largest timing meta-regression found doses taken at least 150 minutes before exercise most effective (Silva et al., 2022). Chronic supplementation beyond 3 days produced stronger effects than acute single-dose administration (Poon et al., 2025), supporting the Daily Primer protocol on rest days to maintain nitrate stores. Individual reviews within that umbrella suggested a minimum of 5 mmol/day (310 mg). NITRATE-IQ™ tells you exactly where your dose sits relative to that range.*
One thing the evidence does not show is a reliable improvement in steady time-trial performance. Pooled analyses find little or no effect on time trials, even though the signals for time-to-exhaustion, muscular endurance and peak power are more consistent (Poon et al., 2025; Gao et al., 2021). If you’re evaluating dietary nitrate in your own training, time-to-exhaustion and repeated-effort work are the endpoints to watch, not steady time-trial pace.
These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.
What 540 mg of Verified NO₃⁻ Is Designed to Support in Training, Racing, and Recovery
The dual-pathway architecture is designed to support the NO signal across a session. Here’s what that’s designed to feel like in daily training.
The Pre-Workout Protocol You Can Finally Control
NITRATE-IQ™’s Performance protocol delivers 540 mg of COA-verified NO₃⁻ at roughly 8.7 mmol, above the ≥6 mmol dose range from the Poon et al. (2025) umbrella review of 180 studies.* Now the independent variable in your pre-workout experiment is actually defined. Take 12 capsules about 2.5 to 3 hours before your session, track your training data, and compare your trend to research that used a known dose. That link between label and literature is exactly what no beet capsule has given you.
It’s the shift from walking into a session hoping the dose was enough to knowing what you took, because the number is on the label, the dose range is in the literature, and the math confirms they line up. “I think this is working” becomes “I know what I took, I know what the research showed at this dose, and I know how to evaluate what I’m feeling.” That’s precision-athlete territory, finally available in a capsule.
The Race-Day Protocol You Can Trust
Zero betalain pigment means no beeturia, whatever the dose or your individual sensitivity. The spinach source delivers the NO₃⁻ ion without the pigment behind the compliance problem that ended your beet-shot protocol. You get 540 mg in capsule form, about 35% more nitrate than a 400 mg beetroot shot, with no liquid logistics, no flavour management on race morning, and none of the shared-facility concerns that turned a performance tool into pre-race anxiety.
Race morning turns into a clean sequence: wake, eat, take 12 capsules about 2.5 to 3 hours before the start, warm up, race. The supplement disappears into the protocol the way good equipment should, present in the result, invisible in the prep.
The 10 PM Bedtime You Didn’t Have to Sacrifice
NITRATE-IQ™ contains zero stimulants. No caffeine, no synephrine, no central nervous system activators of any kind. The performance mechanism, the enterosalivary nitrate-nitrite-NO circuit, works through vascular smooth muscle relaxation and oxygen efficiency, with no neurological footprint. A 7 PM session dosed in the late afternoon leaves no stimulant load at 10 PM, because there’s no stimulant in the formula to begin with.
If you’re the evening athlete who stopped choosing between training quality and sleep quality, here’s the quiet payoff: the vascular fullness you missed from your stimulant days was largely the NO mechanism at work, and that mechanism is fully available without the neurological cost that used to come bundled with it. The session stays. The stimulant-driven sleep disruption is gone.
These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.
The 180-Study Evidence Base Behind Every Milligram on This Label
A note on evidence quality: the research is consistent in direction but modest in certainty. Most component reviews in the umbrella review rated low or critically low on AMSTAR-2, and pooled outcomes in the 73-trial meta-analysis were low or very-low GRADE. Dietary nitrate is one of the better-supported performance ingredients, and it remains a small-effect, moderate-confidence intervention.
NITRATE-IQ™ is informed by the Poon et al. (2025) umbrella review of 20 systematic reviews (180 unique primary studies, 2,672 participants), which found significant pooled improvements in time-to-exhaustion (41 comparisons; SMD 0.33; 95% CI 0.19–0.47), muscular endurance, peak power and total distance, and no significant effect on time-trial performance, VO₂max, muscular strength, mean power output, graded exercise test performance or total work done. In subgroup analyses, doses of at least 6 mmol/day and protocols longer than 3 days were associated with larger time-to-exhaustion effects. NITRATE-IQ™’s 540 mg Performance dose (≈8.7 mmol) sits above that dose range, and it is printed on the label rather than left to chance.*
Study 1. Poon et al. (2025): The Primary Performance Evidence Anchor
Design: Umbrella review of 20 published systematic reviews with meta-analyses; 180 primary human studies; 2,672 participants; multiple exercise modalities, populations, and study durations; published in Sports Medicine (2025).
Finding: Significant pooled improvement in time-to-exhaustion (41 comparisons; SMD 0.33; 95% CI 0.19–0.47), plus muscular endurance, peak power and total distance; no significant effect on time-trial performance, VO₂max, muscular strength, mean power output, graded exercise test or total work done. In subgroup analyses, doses of at least 6 mmol/day (372 mg/day) and protocols longer than 3 days were associated with larger time-to-exhaustion effects. Evidence certainty was limited: 18 of 20 component reviews rated low or critically low on AMSTAR-2, and only 3 reported GRADE.
Why it matters for you: The 6 mmol/day figure is the dose associated with larger time-to-exhaustion effects, and no beet capsule has printed its nitrate content to let you check where you stand. NITRATE-IQ™’s 540 mg Performance dose (≈8.7 mmol) sits about 45% above 6 mmol. Read the label, look up the Poon review, and you can confirm the math in a few minutes. Dietary nitrate is one of the better-supported performance ingredients, and it remains a small-effect, moderate-confidence intervention, so this lets you run a controlled test rather than promising a fixed result.
Citation: Poon ET, Iu JC-K, Sum WM-K, Wong P-S, Lo KK-H, Ali A, Burns SF, Trexler ET. (2025). Dietary Nitrate Supplementation and Exercise Performance: An Umbrella Review of 20 Published Systematic Reviews with Meta-analyses. Sports Medicine, 55(5), 1213–1231. View study
Study 2. Bailey et al. (2009): The O₂-Cost and Endurance Foundation
Design: Randomized, double-blind, placebo-controlled crossover trial; 8 healthy men; 0.5 L/day of beetroot juice (~5.5 mmol/day NO₃⁻) or placebo for 6 days; cycle ergometry at multiple intensities on days 4–6.
Finding: Plasma nitrite rose from 140 ± 50 nM on placebo to 273 ± 44 nM on beetroot juice; the O₂ cost of low-intensity exercise fell by about 5%; time to exhaustion at high intensity was extended by about 16%. This trial measured plasma nitrite before the exercise bouts rather than mapping a full time-course, so the pre-workout timing window in this guide comes from Wylie et al. (2013) instead.
Why it matters for you: This is a foundational demonstration that dietary nitrate lowers the O₂ cost of exercise and extends time to exhaustion at a beetroot-juice dose. The pre-workout timing itself comes from dose-response and pharmacokinetic work (Wylie et al., 2013; Silva et al., 2022), not from this paper, which is why the protocol is set at about 2.5 to 3 hours pre-session.
Citation: Bailey SJ, et al. (2009). Dietary nitrate supplementation reduces the O₂ cost of low-intensity exercise and enhances tolerance to high-intensity exercise in humans. Journal of Applied Physiology, 107(4), 1144–1155. DOI
Study 3. Gao et al. (2021): The VO₂ Efficiency Confirmation
Design: Systematic review and meta-analysis; 73 randomized controlled trials (n≈1,061); multiple exercise modalities and training-status populations.
Finding: Significant reduction in submaximal VO₂ (42 trials; MD −0.04 L/min), increased power output (28 trials; MD +4.59 W) and extended time to exhaustion (20 trials; MD +25.3 s); no significant effect on VO₂max. Only 3 of 73 trials were at low risk of bias, and every pooled outcome was graded low or very-low certainty.
Why it matters for you: Pooled across many trials, dietary nitrate improved oxygen efficiency and several endurance-related outcomes, with the submaximal VO₂ reduction reaching significance in recreationally active participants but not in elite or sedentary groups, though the authors caution this interaction may be spurious and that no conclusive inference should be drawn from it. It’s a mechanistic efficiency improvement that can compound across a training block, not a single-session transformation, and the certainty of the evidence is modest.
Citation: Gao C, et al. (2021). The effects of dietary nitrate supplementation on endurance exercise performance and cardiorespiratory measures in healthy adults: a systematic review and meta-analysis. Journal of the International Society of Sports Nutrition, 18, 55. View study
Study 4. Jedrejko et al. (2024): The Beet-Free Source Evidence
Design: Review of alternative dietary nitrate sources, including green spinach (Spinacia oleracea) and red spinach (Amaranthus spp.), for exercise performance; published in International Journal of Molecular Sciences.
Finding: Spinach carries nitrate at concentrations comparable to beetroot (roughly 900–5,400 mg/kg versus about 2,500 mg/kg). Of the 11 publications reviewed, 8 used red spinach (Amaranthus) rather than green spinach (Spinacia oleracea). On our reading of those included studies, no randomized trial has yet tested green-spinach nitrate at an ergogenic dose.
Why it matters for you: The chemical argument is sound: the NO₃⁻ ion is the same molecule regardless of plant source, and the enterosalivary pathway handles spinach and beet nitrate identically. What the evidence does not yet include is a randomized trial of green-spinach nitrate at an ergogenic dose, so the beet-free source is best understood as a compliance and tolerability advantage delivering the same ion, not as a separately-proven ergogenic source. The absence of betalain pigment removes the beeturia problem.
Citation: Jedrejko M, Jedrejko K, Gómez-Renaud VM, Kała K, Muszyńska B. (2024). Exploring the Impact of Alternative Sources of Dietary Nitrate Supplementation on Exercise Performance. International Journal of Molecular Sciences, 25(7), 3650. PMC11012081
Study 5. Gallardo & Coggan (2019): The Market Transparency Documentation
Design: Independent HPLC analysis of 45 lots of 24 commercially available beetroot juice products from 21 companies; verified NO₃⁻ content per serving.
Finding: NO₃⁻ content varied enormously between products, by roughly a factor of 50, and between lots of the same product. Only 5 of the 24 products consistently supplied at least 5 mmol per serving, which the authors describe as the minimum likely needed to enhance performance in most people. The authors state that figure in millimoles; 5 mmol converts to about 310 mg of NO₃⁻.
Why it matters for you: This is the peer-reviewed version of what you already lived. Prior beet product results were inconsistent because the doses were inconsistent, and no label told you where you stood relative to the line the research drew. NITRATE-IQ™’s labeled-milligram architecture is a direct structural answer to that documented variability.
Citation: Gallardo EJ, Coggan AR. (2019). What Is in Your Beet Juice? Nitrate and Nitrite Content of Beet Juice Products Marketed to Athletes. International Journal of Sport Nutrition and Exercise Metabolism, 29(4), 345–349. https://doi.org/10.1123/ijsnem.2018-0223
Study 6. Grape-Seed Extract: Second-Pathway Support (Schön et al., 2021)
The standardized grape-seed extract at the Performance tier is Enovita® (Indena), the extract named in the source study. Two things are worth stating plainly. In laboratory experiments using human endothelial cells, the extract reduced sICAM-1 and endothelin-1 and increased eNOS phosphorylation (Schön et al., 2021), which is the mechanistic basis for including it as a second, enzymatic route to nitric oxide. In the same publication’s randomized, double-blind, placebo-controlled human trial (300 mg/day for 16 weeks in adults with elevated systolic blood pressure), the primary blood-pressure endpoint was not met; a reduction appeared only in a male subgroup, and the study was conducted with authors employed by the ingredient manufacturer. So the eNOS and antioxidant rationale is grounded mainly in cell-based work, and the extract’s effect on exercise performance in humans has not been established. NITRATE-IQ™ includes 300 mg, the dose used in that trial, and is not intended to affect blood pressure or any disease.*
When Should I Take Dietary Nitrate Before a Workout?
Dietary nitrate supplementation should be timed to align with the plasma nitrite peak that drives exercise performance effects. Plasma nitrite rises over the hours after ingestion, and dose-response trials exercised participants about 2.5 hours post-dose (Wylie et al., 2013), with the largest timing meta-regression finding doses taken at least 150 minutes before exercise most effective (Silva et al., 2022). NITRATE-IQ™’s Performance protocol (12 capsules, 540 mg NO₃⁻) taken about 2.5 to 3 hours before high-intensity training delivers ≈8.7 mmol of dietary nitrate, above the ≥6 mmol dose range identified in Poon et al. (2025) for time-to-exhaustion support. For chronic loading, the Poon et al. umbrella review found supplementation beyond 3 days produced greater effects than acute single-dose administration, supporting daily nitrate stores via the 3-cap Daily Primer (135 mg NO₃⁻) on rest and light training days. Unlike stimulant-based pre-workouts with caffeine half-life to manage, NITRATE-IQ™ is fully stimulant-free, appropriate for evening athletes and for competition-day protocols where stimulant timing adds another variable.*
These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.
Why NITRATE-IQ™ Is a Beet-Free, Labeled-Dose Capsule Above the 6 mmol Dose Range
A beet-free, labeled-dose capsule above the 6 mmol performance dose range: that’s NITRATE-IQ™’s competitive position. We’re not aware of another product that combines all four of these characteristics at once.*
For evening athletes and sleep-sensitive schedules:
✓ Optimal: NITRATE-IQ™, zero stimulants, no caffeine half-life to manage, full Performance dose appropriate at any training hour.
○ Alternative: L-Citrulline malate stack, stimulant-free and addresses the eNOS pathway, but lacks the NOS-independent substrate mechanism.
✗ Avoid: stimulant pre-workouts, where a caffeine half-life averaging about 5 hours (and reaching 9 hours or more in some people) can disrupt sleep for athletes training after 4 PM. Caffeine also acts on the vascular system through a sympathetic pathway distinct from the nitrate route.
For evidence-literate athletes who verify dose against research:
✓ Optimal: NITRATE-IQ™, 540 mg labeled NO₃⁻ (≈8.7 mmol), above the ≥6 mmol Poon et al. dose range.
○ Alternative: a labeled concentrated beetroot shot, transparent dose (typically about 400 mg / ~6.4 mmol), but liquid and beet-derived.
✗ Avoid: generic beet capsules, usually with no labeled mg NO₃⁻, so you can’t verify your position relative to the research dose range.
For competitive athletes in shared facilities:
✓ Optimal: NITRATE-IQ™, zero betalain pigment, no beeturia risk regardless of dose, beet-free source that removes race-day compliance management.
○ Alternative: any non-dietary-nitrate stimulant-free option, which avoids beeturia but loses the performance mechanism.
✗ Avoid: beet-derived products, since beeturia affects 10 to 14% of people (Watts et al., 1993) and the race-day complications end many experienced beet-protocol users’ regimens.
For athletes transitioning off stimulants:
✓ Optimal: NITRATE-IQ™, supporting the vascular pump experience through a mechanistically independent route, with no tolerance development and no withdrawal.
○ Alternative: a betaine anhydrous plus L-Citrulline combination, stimulant-free and additive on the eNOS pathway, but lacking the NOS-independent substrate mechanism.
✗ Avoid: “stim-free” pre-workouts with unverified NO blends, which often rely on proprietary citrulline/arginine blends that reproduce the dose-uncertainty problem.
Is There a Beet-Free Dietary Nitrate Supplement That Actually Works?
Yes. NITRATE-IQ™ is a beet-free, labeled-dose capsule that delivers dietary nitrate above the ≥6 mmol performance dose range documented in the Poon et al. (2025) umbrella review of 180 studies. The formula uses Nitrate Burst™ spinach extract, standardized to 9% NO₃⁻ by ion chromatography, delivering the NO₃⁻ ion through the same enterosalivary nitrate-nitrite-NO circuit as beet-derived nitrate.
Zero betalain pigment removes beeturia regardless of dose or individual sensitivity. Jedrejko et al. (2024, Int J Mol Sci) reviewed spinach as an alternative dietary nitrate source with nitrate concentrations comparable to beetroot, with 8 of the 11 included studies using red spinach (Amaranthus); on our reading of those studies, no randomized trial has yet tested green-spinach nitrate at an ergogenic dose, so the ergogenic evidence comes from beetroot studies while the nitrate ion itself is identical across sources. At 540 mg NO₃⁻ per Performance dose (≈8.7 mmol), NITRATE-IQ™ exceeds the Poon dose range and matches or exceeds the dose delivered by labeled concentrated beetroot shots (typically about 400 mg / ~6.4 mmol), in a capsule format that removes the compliance barriers that drove beet-protocol abandonment.*
These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.
Your Questions About Stimulant-Free Nitrate Performance: Answered
How is NITRATE-IQ™ different from the beet capsules I tried that produced inconsistent results? Your previous beet capsules almost certainly had unverifiable dietary nitrate content. A product listing “500mg beet root powder” instead of milligrams of NO₃⁻ is delivering an unknown dose. Gallardo and Coggan (2019) found only 5 of 24 commercial beetroot products consistently supplied at least 5 mmol (about 310 mg) per serving, the amount described as the likely minimum for a performance effect.
If your capsules delivered less than the amount used in the research, dose is at least one plausible explanation for inconsistent results, and unlike training load or sleep, it’s the variable you can now control. NITRATE-IQ™’s Performance protocol delivers 540 mg (≈8.7 mmol) of COA-verified NO₃⁻, documented on the label, from beet-free Nitrate Burst™ spinach extract. No beeturia. Same NO₃⁻ ion. And a number on the label you can check against the research.*
Can I use the Performance dose for a 7 PM training session, since it’s stimulant-free? Yes. NITRATE-IQ™ contains zero stimulants, no caffeine, no synephrine, no central nervous system activators of any kind. The performance mechanism, the enterosalivary nitrate-nitrite-NO circuit, works through vascular smooth muscle relaxation and oxygen efficiency, with no neurological stimulation. Plasma nitrate peaks about 3 hours after ingestion and plasma nitrite later still, across a range of doses (Capper et al., 2022), which is why the Performance protocol is taken about 2.5 to 3 hours before a session rather than minutes before. Because there’s no stimulant in the formula, an afternoon dose ahead of a 7 PM session leaves no stimulant load to carry into the evening. This is the foundation of evidence-based stimulant-free pre-workout supplementation.*
What dose on race day versus rest days? Race day: 12 capsules (540 mg NO₃⁻ / ≈8.7 mmol), taken about 2.5 to 3 hours before the start, the window used in the dose-response trials (Wylie et al., 2013; Silva et al., 2022). For chronic loading, take the 3-cap Daily Primer (135 mg) daily through the training week; Poon et al. (2025) found chronic supplementation beyond 3 days outperforms acute single-dose administration. Rest days: 3 caps (135 mg) to maintain nitrate stores. One bottle covers training, recovery, and race-day protocols without a second SKU.*
Is spinach nitrate a legitimate source for performance? Yes. The NO₃⁻ ion from spinach is the same molecule as beet-derived NO₃⁻: same absorption, same salivary concentration, same bacterial reduction to nitrite, same downstream NO generation. Jedrejko et al. (2024, Int J Mol Sci) reviewed spinach as an alternative nitrate source with nitrate concentrations comparable to beetroot; most performance trials in that review used red spinach (Amaranthus), and the ergogenic evidence for nitrate itself comes from beetroot studies, while the nitrate ion is identical across sources. The practical difference is that spinach carries no betalain pigment, which removes beeturia.*
8.7 mmol. Labeled. Verified. Stimulant-Free. Above the Dose Range.
NITRATE-IQ™ is informed by the Poon et al. (2025) umbrella review of 180 studies, which found significant improvements in time-to-exhaustion (and no significant effect on several other outcomes, including time trials). Doses of at least 6 mmol/day were associated with larger time-to-exhaustion effects in subgroup analyses, and NITRATE-IQ™’s 540 mg Performance dose (≈8.7 mmol) sits above that range, declared in milligrams on the label.*
You’ve done the research. You know the dose range. You know what the capsule you were taking couldn’t confirm. NITRATE-IQ™ is a stimulant-free, beet-free dietary nitrate supplement that declares its nitrate content in milligrams on the label, a combination we have not found in another capsule product as of August 2026, for evidence-oriented recreational athletes who want a verified pre-workout dose they can take at any training hour without beeturia or caffeine dependency.*
Triquetra Health has served more than 2 million customers and holds an average rating of [X.X] stars across [N] reviews, including 32,600+ five-star reviews (figures as of [Month Year]). It’s the same quality infrastructure behind BioBeet, Triquetra’s existing beet extract product, now applied to a labeled-milligram, beet-free capsule above the ≥6 mmol dose range.
What Can Replace a Stimulant Pre-Workout for Evening Training?
For athletes moving away from stimulant-based pre-workouts due to sleep disruption, caffeine tolerance, or training-schedule incompatibility, dietary nitrate supplementation provides an evidence-based, stimulant-free alternative with a mechanistically distinct performance pathway. While stimulant pre-workouts operate through sympathetic nervous system activation and adenosine receptor antagonism, dietary nitrate acts through the enterosalivary nitrate-nitrite-NO circuit, generating NO via a NOS-independent pathway that supports oxygen efficiency and vascular blood flow without central nervous system stimulation. NITRATE-IQ™’s Performance protocol (540 mg NO₃⁻, ≈8.7 mmol) is taken about 2.5 to 3 hours before a session and contains no stimulant, so it has no stimulant effect on sleep onset, making it a labeled-dose pre-workout option appropriate for evening athletes. The Gao et al. (2021) meta-analysis of 73 randomized controlled trials found a significant reduction in submaximal VO₂ across the 42 trials measuring it, alongside improvements in other endurance-related outcomes, the oxygen efficiency that can show up as holding goal pace through the final third of a hard effort rather than fading. The benefit is mechanistic, not stimulant-based, and does not produce tolerance requiring dose escalation over time.*
Learn More About NITRATE-IQ™ →
Backed by Triquetra Health’s 60-day satisfaction guarantee (see guarantee page for terms).
These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.
For the Evidence-Literate Athlete: Complete Protocol and Ingredient Documentation
Full Ingredient Technical Profiles
Nitrate Burst™ Spinach Extract (Spinacia oleracea), 1,500 / 3,000 / 6,000 mg at 3 / 6 / 12 caps Standardized to 9% dietary nitrate (NO₃⁻) and 13% naturally co-occurring potassium (K⁺) by dual-marker COA verification on every inbound batch. Nitrate content is confirmed by ion chromatography and potassium by flame photometry on every inbound batch before capsule fill.
The spinach source delivers the NO₃⁻ ion with zero betalain pigment (no beeturia risk regardless of dose), zero beet sugars (relevant if you’re watching carbohydrate intake), and no earthy taste. Jedrejko et al. (2024) reviewed spinach as an alternative nitrate source with nitrate concentrations comparable to beetroot; the nitrate ion is identical across sources and travels the same enterosalivary pathway, though the ergogenic trials to date used beetroot or red spinach rather than green-spinach nitrate at a performance dose. Per-protocol amounts: 135 / 270 / 540 mg NO₃⁻; 195 / 390 / 780 mg K⁺. The 540 mg Performance dose equals roughly 8.7 mmol, above the ≥6 mmol Poon et al. dose range.
Anti-Doping Note for Competitive Athletes: NITRATE-IQ™ is not currently NSF Certified for Sport; certification has been applied for. Dietary nitrate from food-form spinach extract is not a prohibited substance under the 2026 WADA List. Until certification is granted, competitive athletes should consult their governing body’s anti-doping advisor regarding their specific competitive context.
Standardized Grape-Seed Extract (>95% OPCs), 75 / 150 / 300 mg at 3 / 6 / 12 caps A grape-seed extract (Enovita®, Indena S.p.A., the extract named in the source study), produced in a cGMP facility in Tours, France, using grape seeds from white-wine production and water as the sole extraction solvent. It’s standardized to >95% total proanthocyanidins with a defined 5 to 15% flavane-monomer fraction (catechin, epicatechin), with full supply-chain traceability and no organic-solvent residues.
At 300 mg (Performance protocol), the extract is included for its eNOS-phosphorylation and antioxidant activity, effects reported in the human endothelial cell experiments within Schön et al. (2021); the same publication’s human blood-pressure trial did not meet its primary endpoint, and there is no human trial of this extract for exercise performance. NITRATE-IQ™’s Performance tier delivers 300 mg, the dose used in that trial, as the enzymatic complement to the dietary nitrate substrate pathway.
Natural Potassium (K⁺), 195 / 390 / 780 mg at 3 / 6 / 12 caps Naturally co-occurring from the Nitrate Burst™ spinach matrix at 13% by weight, not added as an isolated mineral salt. It’s food-form, organic-ligand potassium. At the 12-cap Performance tier, 780 mg K⁺ (about 17% DV) contributes to daily potassium intake. Potassium is an essential mineral involved in normal muscle and vascular smooth-muscle function. Laboratory work describes a role for large-conductance calcium-activated potassium (BKCa) channels in vascular smooth muscle, but that pathway has not been tested in a human supplementation trial, and a meta-analysis of five potassium intervention studies (8 cohorts, 332 participants) found only a small pooled improvement in flow-mediated dilation (mean difference 0.74%; 95% CI 0.22–1.25), with no pooled effect reported for other vascular endpoints (D’Elia et al., 2023). Treat the potassium here as a nutrient contribution, not a proven performance mechanism.
Safety: There is no established upper limit for potassium in the United States; the National Academies did not set one because of insufficient evidence (NIH Office of Dietary Supplements). The adult Adequate Intake is 3,400 mg/day for men and 2,600 mg/day for women, and 780 mg from the Performance protocol contributes about 17% of the 4,700 mg Daily Value. The primary interaction consideration is potassium-sparing diuretics, ACE inhibitors and ARBs; consult a healthcare provider before use on these medications.
Fulvic Acid, 30 / 60 / 120 mg at 3 / 6 / 12 caps Purified fulvic acid, included as a minor formulation component rather than an efficacy driver. There are no human trials of fulvic acid for exercise performance or antioxidant status; a rodent and in vitro assessment reported no genotoxicity and a no-observed-adverse-effect level of 5,000 mg/kg/day (Dai et al., 2020). Heavy-metal contamination has been a documented problem in this ingredient category: the FDA issued a public health alert in 2021 for a fulvic acid product with elevated lead and arsenic. Every NITRATE-IQ™ lot is tested by ICP-MS for lead, arsenic, mercury and cadmium against Prop 65 limits, with results on the batch COA.
Protocol Guide for Specific Athletic Disciplines
Cyclists (Road, Gravel, Track): Training days: 12 caps about 2.5 to 3 hours pre-session. Rest and easy-spin days: 3 caps with breakfast. Race or event day: 12 caps about 2.5 to 3 hours before the start, with the Daily Primer for 5 to 7 days prior for chronic loading. One note: avoid antiseptic mouthwash within 2 hours of dosing. Regular fluoride toothpaste is fine.
Runners (5K through Marathon): Quality sessions and long runs: 12 caps about 2.5 to 3 hours before. Easy and recovery runs: 3 caps with breakfast. Race day: same as cyclists, and a 5 to 7-day Primer loading phase pre-race is supported by the Poon et al. chronic-supplementation finding.
CrossFit and Strength-Endurance Athletes: WODs and metcons: 12 caps about 2.5 to 3 hours before. Strength-only sessions: 6 caps (Session protocol) or 3 caps at your discretion. Active-recovery days: 3 caps to maintain nitrate stores.
Triathletes: Race week: 3-cap Primer daily, Monday through Friday. Race morning: 12 caps about 2.5 to 3 hours pre-start. One note: the beet-free source removes transition-area beeturia concerns.
Safety, Interactions, and Practical Guidance
Antiseptic mouthwash (chlorhexidine or cetylpyridinium chloride): This is the single most important practical instruction in the protocol. These compounds reduce the oral bacteria central to NO₃⁻ to NO₂⁻ conversion, which can substantially blunt the primary mechanism. Don’t use within two hours of dosing. Regular fluoride toothpaste is fine and doesn’t meaningfully affect the nitrate-reducing bacteria.
Drug interactions: Two separate cautions apply. Potassium-related: if you take potassium-sparing diuretics, ACE inhibitors or ARBs, consult your healthcare provider before use, because this product supplies 195 to 780 mg of potassium per protocol. Nitrate-related: if you take PDE-5 inhibitors (for example sildenafil or tadalafil) or any nitrate-based medication, consult your healthcare provider before use, because combining nitric-oxide-donating compounds with these medicines can lower blood pressure significantly. Space medications 1 to 2 hours before or after dosing as a general precaution.
Combining with existing citrulline stacks: L-Citrulline and NITRATE-IQ™ target different, non-overlapping upstream NO pathways. Using both is additive, not redundant. There are no interaction concerns, and relative timing is flexible.
Nitrate intake context: The 540 mg Performance dose is about twice the acceptable daily intake for nitrate as a food additive (3.7 mg/kg body weight/day, roughly 259 mg for a 70 kg adult), a value originally set by the EU Scientific Committee for Food and reconfirmed by JECFA, which EFSA upheld in its 2017 re-evaluation. That benchmark was set for nitrate used as a preservative, not for nitrate from vegetables; EFSA has noted the additive ADI is routinely exceeded through normal vegetable intake and that the benefits of eating vegetables outweigh the potential risks. Performance-research doses, including the trials referenced here, sit above the additive ADI by design.
Contraindications: Severe renal disease (because impaired potassium excretion raises the risk of hyperkalemia); low resting blood pressure (resting systolic below 90 mmHg); known hypersensitivity to any ingredient. Pregnant or nursing athletes should consult their healthcare provider before use. Consult your healthcare provider before starting any new supplement regimen.
Extended FAQ
How does NITRATE-IQ™ compare to labeled concentrated beetroot shots for race-day performance? A labeled concentrated beetroot shot typically delivers about 400 mg NO₃⁻ (≈6.4 mmol) per 70 mL: labeled and a category benchmark for dose transparency. NITRATE-IQ™ delivers 540 mg NO₃⁻ (≈8.7 mmol) in capsule form, about 35% more nitrate, beet-free, with a standardized grape-seed extract adding a second NO pathway the shot doesn’t include. The key advantages for experienced beet-protocol users: no liquid logistics, no betalain pigment, no beeturia, and three-tier protocol adjustability for rest days. Both formats meet the transparency standard the category needs; NITRATE-IQ™ adds dose, format, mechanism, and source cleanliness.*
Can I combine NITRATE-IQ™ with my existing L-Citrulline stack? Yes, and the combination is additive rather than redundant. L-Citrulline targets the enzymatic eNOS pathway by raising plasma L-arginine, increasing substrate availability for enzymatic NO production. NITRATE-IQ™’s dietary nitrate targets the NOS-independent enterosalivary pathway, generating NO without eNOS involvement. Those are two non-overlapping upstream routes to the same downstream NO cascade. Timing between them is flexible, with no interaction concerns. Athletes running a citrulline stack who add NITRATE-IQ™ are adding complementary mechanism coverage, not duplicating it.*
What is the antiseptic mouthwash interaction, and how do I manage it on race morning? Antiseptic mouthwash compounds (chlorhexidine, cetylpyridinium chloride) suppress the tongue-dorsum bacteria (including Veillonella, Actinomyces and Rothia; Doel et al., 2005) that convert salivary nitrate to nitrite. In a small human crossover study (n=7), an antibacterial mouthwash markedly attenuated the rise in plasma nitrite after a nitrate load (Govoni et al., 2008). Without that step, dietary NO₃⁻ can’t efficiently generate plasma nitrite. Management is simple: don’t use antiseptic mouthwash within two hours of taking NITRATE-IQ™. On race morning, use regular fluoride toothpaste for pre-race oral hygiene. That one behavioral adjustment preserves the mechanism.*
How does dietary nitrate support oxygen efficiency specifically? Dietary nitrate’s oxygen efficiency support runs through two convergent effects on skeletal muscle. First, NO-mediated vasodilation supports O₂ delivery to working muscle, so there’s more oxygen available per unit of effort. Second, dietary nitrate is associated with a reduced ATP cost of skeletal muscle contraction, meaning the muscle needs less energy to generate the same force (Bailey et al., 2010), which supports contractile efficiency. The net effect is the reduction in submaximal VO₂ pooled across the 42 trials that measured it, within the Gao et al. (2021) meta-analysis of 73 randomized controlled trials. At threshold pace, small O₂-cost reductions can be the difference between the final interval holding and breaking.*
What does the grape-seed extract add to a performance protocol beyond dietary nitrate alone? The standardized grape-seed extract (>95% OPCs), produced in a cGMP facility in France using water-only extraction, contributes through two mechanisms dietary nitrate alone doesn’t address. First, in laboratory experiments using human endothelial cells, OPCs increased eNOS phosphorylation via PI3K/Akt signaling (Schön et al., 2021), the mechanistic rationale for including a second, enzymatic route alongside the NOS-independent nitrate pathway; this mechanism has not been tested for exercise performance in humans. Second, OPC antioxidant activity helps limit oxidative loss of NO during intense exercise, when superoxide production peaks. The intended result: the vascular fullness and oxygen efficiency that peaks with plasma nitrite at the first interval is supported through later sets and kilometers.*
What Dietary Nitrate Protocol Should I Use on Race Day?
For competition-day dietary nitrate loading, the evidence supports both chronic pre-loading and acute race-day dosing. The Poon et al. (2025) umbrella review found chronic supplementation beyond 3 days produced stronger effects than single-dose acute administration, making a 5 to 7-day loading phase before competition reasonable. Take the 3-cap Daily Primer (135 mg NO₃⁻) daily during the training week, then use the 12-cap Performance dose (540 mg NO₃⁻, ≈8.7 mmol) about 2.5 to 3 hours before the start, the window used in the dose-response trials (Wylie et al., 2013; Silva et al., 2022). NITRATE-IQ™’s beet-free formulation (Nitrate Burst™ spinach extract) removes the beeturia and betalain-pigment concerns that have made beet-based race-day protocols a compliance decision as much as a performance decision: no shared-facility concerns, no pink discoloration, no beet-flavor management. The 540 mg Performance dose (≈8.7 mmol) exceeds the ≥6 mmol research dose range and matches or exceeds the dose delivered by labeled concentrated beetroot shots (typically about 400 mg per 70 mL) in capsule format. One critical note: avoid antiseptic mouthwash within two hours of dosing on race morning, since chlorhexidine disrupts the oral bacterial conversion central to the enterosalivary nitrate-nitrite-NO circuit.*
These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.
The Dose Has Always Been the Variable. Now It’s on the Label.
By now you understand why the beet capsule protocol produced inconsistent results: the independent variable was never defined. You understand the two NO routes working together in every Performance dose, the enterosalivary nitrate circuit and the grape-seed enzymatic support, with potassium along for the ride as a nutrient. You understand that spinach delivers the same NO₃⁻ ion through the same pathway, and that the missing betalain pigment is a mechanistically irrelevant subtraction with a compliance-relevant upside. And you understand that 8.7 mmol sits above the 6 mmol/day dose range the Poon umbrella review associated with larger time-to-exhaustion effects.
NITRATE-IQ™ is a stimulant-free, beet-free dietary nitrate supplement that declares its nitrate content in milligrams on the label, a combination we have not found in another capsule product as of August 2026, for evidence-oriented recreational athletes who want a verified pre-workout dose they can take at any training hour without beeturia or caffeine dependency.*
The Poon umbrella review exists. The ≥6 mmol dose range is documented. 540 mg at 8.7 mmol clears it. The label says so, and the COA confirms it. Your next pre-workout countdown can start with certainty instead of hope.
Take control of the variable:
Learn More About NITRATE-IQ™ →
Backed by Triquetra Health’s [XX]-day satisfaction guarantee (see guarantee page for terms) and a labeled-milligram NO₃⁻ declaration in the beet-free capsule category. NITRATE-IQ™ is not currently NSF Certified for Sport; certification has been applied for.
NITRATE-IQ™ is designed for:
✓ Recreational endurance athletes who need a stimulant-free pre-workout protocol appropriate for evening training without sleep disruption
✓ Athletes who have moved away from stimulant-based pre-workouts due to caffeine tolerance, sleep disruption, or training-schedule incompatibility
✓ Anyone whose previous beet supplements fell short due to beeturia compliance problems, especially at races or in shared facilities
✓ Athletes who want to verify their pre-workout dietary nitrate dose maps to the ≥6 mmol performance dose range in published research
✓ Evidence-literate athletes using power meters, Strava, or GPS tracking who want a supplement with a verifiable, controlled input variable
✓ Anyone whose competition-day protocol needs a reliable pre-race supplement free of beeturia concerns
✓ Athletes who want to maintain a nitrate baseline on rest days using a lower dose from the same bottle
On the other hand, NITRATE-IQ™ may not be the priority when the primary training goal is maximal strength expression rather than endurance and oxygen efficiency; for highly trained athletes, since Poon et al. (2025) note that several of the individual reviews they assessed reported more pronounced effects in non-athletes and recreationally active individuals than in highly trained athletes, with a possible ceiling effect (an observation drawn from the included reviews rather than a subgroup analysis by the umbrella review itself); or when per-session cost at the Performance protocol is a meaningful budget constraint.
Scientific References & Citations
This guide’s performance statements are informed by peer-reviewed research. The lead reference appears first, followed by supporting references in alphabetical order, each with a resolvable identifier.
Primary Performance Study (Lead Reference) Poon, E.T., Iu, J.C.-K., Sum, W.M.-K., Wong, P.-S., Lo, K.K.-H., Ali, A., Burns, S.F., & Trexler, E.T. (2025). Dietary Nitrate Supplementation and Exercise Performance: An Umbrella Review of 20 Published Systematic Reviews with Meta-analyses. Sports Medicine, 55(5), 1213–1231. https://doi.org/10.1007/s40279-025-02194-6. Relevance: Primary anchor for the Performance protocol. Umbrella review of 20 meta-analyses, 180 primary studies, 2,672 participants. Reports overall TTE effect SMD 0.33 (95% CI 0.19–0.47); subgroup analyses indicate more pronounced effects at ≥6 mmol/day (372 mg/day) and chronic (>3 day) supplementation. The ≥6 mmol/day figure is the central dose anchor for this guide, presented as a subgroup association rather than a validated threshold.
Supporting References (alphabetical)
Bailey, S.J., Winyard, P., Vanhatalo, A., Blackwell, J.R., DiMenna, F.J., Wilkerson, D.P., Tarr, J., Benjamin, N., & Jones, A.M. (2009). Dietary nitrate supplementation reduces the O₂ cost of low-intensity exercise and enhances tolerance to high-intensity exercise in humans. Journal of Applied Physiology, 107(4), 1144–1155. https://doi.org/10.1152/japplphysiol.00722.2009. Relevance: Foundational RCT reporting ~5% O₂-cost reduction and ~16% time-to-exhaustion extension at a beetroot-juice dose (~5.5 mmol). Note: this paper reports elevated plasma nitrite on supplementation days but no pharmacokinetic time-course; the peak-timing figure is sourced to Wylie et al. (2013).
Bailey, S.J., Fulford, J., Vanhatalo, A., Winyard, P.G., Blackwell, J.R., DiMenna, F.J., Wilkerson, D.P., Benjamin, N., & Jones, A.M. (2010). Dietary nitrate supplementation enhances muscle contractile efficiency during knee-extensor exercise in humans. Journal of Applied Physiology, 109(1), 135–148. https://doi.org/10.1152/japplphysiol.00046.2010. Relevance: ³¹P-MRS trial measuring reduced ATP cost of muscle force production; supports the efficiency statements. Note: an erratum was published at Journal of Applied Physiology, 109(3), 943; it has no separate DOI or PubMed record and cannot be linked directly.
Capper, T.E., Siervo, M., Clifford, T., Taylor, G., Iqbal, W., West, D., & Stevenson, E.J. (2022). Pharmacokinetic profile of incremental oral doses of dietary nitrate in young and older adults: a crossover randomized clinical trial. The Journal of Nutrition, 152(1), 130–139. https://doi.org/10.1093/jn/nxab354. Relevance: Dose-matched (~544 mg) human PK; plasma nitrate peaks ~3 h and nitrite later. Supports the timing rationale.
Dai, C., Xiao, X., Yuan, Y., Sharma, G., & Tang, S. (2020). A comprehensive toxicological assessment of fulvic acid. Evidence-Based Complementary and Alternative Medicine, 2020, 8899244. https://doi.org/10.1155/2020/8899244. Relevance: Rodent and in vitro toxicology assessment (NOAEL 5,000 mg/kg/day); no human efficacy data.
D’Elia, L., Cappuccio, F.P., Masulli, M., La Fata, E., Rendina, D., & Galletti, F. (2023). Effect of potassium supplementation on endothelial function: a systematic review and meta-analysis of intervention studies. Nutrients, 15(4), 853. https://doi.org/10.3390/nu15040853. Relevance: Small pooled improvement in flow-mediated dilation with potassium; basis for the potassium nutrient-contribution framing.
Doel, J.J., Benjamin, N., Hector, M.P., Rogers, M., & Allaker, R.P. (2005). Evaluation of bacterial nitrate reduction in the human oral cavity. European Journal of Oral Sciences, 113(1), 14–19. https://doi.org/10.1111/j.1600-0722.2004.00184.x. Relevance: Identifies tongue-dorsum nitrate-reducing bacteria (Veillonella, Actinomyces, Rothia).
EFSA Panel on Food Additives and Nutrient Sources added to Food (ANS), Mortensen, A., Aguilar, F., Crebelli, R., Di Domenico, A., Dusemund, B., Frutos, M. J., Galtier, P., Gott, D., Gundert-Remy, U., Lambré, C., Leblanc, J.-C., Lindtner, O., Moldeus, P., Mosesso, P., Oskarsson, A., Parent-Massin, D., Stankovic, I., Waalkens-Berendsen, I., Woutersen, R. A., … Younes, M. (2017). Re-evaluation of sodium nitrate (E 251) and potassium nitrate (E 252) as food additives. EFSA Journal, 15(6), 4787. https://doi.org/10.2903/j.efsa.2017.4787. Relevance: Source for the nitrate additive ADI context. The ADI of 3.7 mg/kg bw/day was established by the SCF (1997) and reconfirmed by JECFA (2002); the 2017 EFSA re-evaluation found insufficient evidence to withdraw it but did not derive a new value.
Gallardo, E.J., & Coggan, A.R. (2019). What Is in Your Beet Juice? Nitrate and Nitrite Content of Beet Juice Products Marketed to Athletes. International Journal of Sport Nutrition and Exercise Metabolism, 29(4), 345–349. https://doi.org/10.1123/ijsnem.2018-0223. Relevance: Independent HPLC analysis of 45 lots of 24 beetroot juice products from 21 companies; only 5 consistently supplied at least 5 mmol (about 310 mg) per serving, described as the likely minimum for a performance effect, with roughly 50-fold variation between products. The market-variability finding that NITRATE-IQ™’s labeled-milligram architecture addresses.
Gao, C., Gupta, S., Adli, T., Hou, W., Coolsaet, R., Hayes, A., Kim, K., Pandey, A., Gordon, J., Chahil, G., Belley-Coté, E.P., & Whitlock, R.P. (2021). The effects of dietary nitrate supplementation on endurance exercise performance and cardiorespiratory measures in healthy adults: a systematic review and meta-analysis. Journal of the International Society of Sports Nutrition, 18(1), 55. https://doi.org/10.1186/s12970-021-00450-4. Relevance: Meta-analysis of 73 RCTs (n≈1,061): submaximal VO₂ reduction (42 trials), power output (28 trials) and time-to-exhaustion (20 trials) improvements; no VO₂max effect. Pooled outcomes were low or very-low GRADE certainty.
Govoni, M., Jansson, E.Å., Weitzberg, E., & Lundberg, J.O. (2008). The increase in plasma nitrite after a dietary nitrate load is markedly attenuated by an antibacterial mouthwash. Nitric Oxide, 19(4), 333–337. https://doi.org/10.1016/j.niox.2008.08.003. Relevance: Mechanistic basis for the antiseptic-mouthwash guidance.
Jedrejko, M., Jedrejko, K., Gómez-Renaud, V.M., Kała, K., & Muszyńska, B. (2024). Exploring the Impact of Alternative Sources of Dietary Nitrate Supplementation on Exercise Performance. International Journal of Molecular Sciences, 25(7), 3650. https://doi.org/10.3390/ijms25073650. PMC11012081. Relevance: Review of alternative nitrate sources; spinach nitrate concentrations comparable to beetroot. 8 of the 11 included studies used red spinach (Amaranthus); on our reading of those studies, no randomized trial has tested green-spinach nitrate at an ergogenic dose. Basis for the beet-free source’s chemical (same-ion) argument, not a standalone ergogenic proof.
Qin, L., Liu, X., Sun, Q., Fan, Z., Xia, D., Ding, G., Ong, H. L., Adams, D., Gahl, W. A., Zheng, C., Qi, S., Jin, L., Zhang, C., Gu, L., He, J., Deng, D., Ambudkar, I. S., & Wang, S. (2012). Sialin (SLC17A5) functions as a nitrate transporter in the plasma membrane. Proceedings of the National Academy of Sciences, 109(33), 13434–13439. https://doi.org/10.1073/pnas.1116633109. Relevance: Source for the ~10-fold salivary nitrate concentration.
Schön, C., Allegrini, P., Engelhart-Jentzsch, K., Riva, A., & Petrangolini, G. (2021). Grape Seed Extract Positively Modulates Blood Pressure and Perceived Stress: A Randomized, Double-Blind, Placebo-Controlled Study in Healthy Volunteers. Nutrients, 13(2), 654. https://doi.org/10.3390/nu13020654. PMID: 33671310. PMC7922661. Relevance: Note: the human blood-pressure endpoint in this study was not met, and NITRATE-IQ™ makes no blood-pressure claim; this extract is included for its cell-based eNOS and antioxidant mechanism only. Enovita® grape-seed extract. sICAM-1/endothelin-1 reduction and eNOS phosphorylation were observed in a human endothelial cell (HUVEC) model; the human randomized arm (300 mg/day, 16 weeks, elevated-BP adults) did not meet its primary blood-pressure endpoint (a signal appeared only in a male subgroup). Authors include ingredient-manufacturer employees. Basis for including the extract for its cell-based eNOS/antioxidant mechanism at the 300 mg dose; no human exercise-performance trial exists.
Silva, K.V.C., Costa, B.D., Gomes, A.C., Saunders, B., & Mota, J.F. (2022). Factors that moderate the effect of nitrate ingestion on exercise performance: a systematic review with meta-analyses and meta-regressions. Advances in Nutrition, 13(5), 1866–1881. https://doi.org/10.1093/advances/nmac054. Relevance: 123-RCT timing meta-regression; most effective acute protocol was doses taken ≥150 minutes before exercise. Basis for the 2.5–3 h protocol.
Vanhatalo, A., Blackwell, J. R., L’Heureux, J. E., Williams, D. W., Smith, A., van der Giezen, M., Winyard, P. G., Kelly, J., & Jones, A. M. (2018). Nitrate-responsive oral microbiome modulates nitric oxide homeostasis and blood pressure in humans. Free Radical Biology and Medicine, 124, 21–30. https://doi.org/10.1016/j.freeradbiomed.2018.05.078. Relevance: Rothia and Neisseria expand most with nitrate intake.
Watts, A.R., Lennard, M.S., Mason, S.L., Tucker, G.T., & Woods, H.F. (1993). Beeturia and the biological fate of beetroot pigments. Pharmacogenetics, 3(6), 302–311. https://doi.org/10.1097/00008571-199312000-00004. Relevance: Source for the 10–14% beeturia-prevalence figure.
Wylie, L.J., Kelly, J., Bailey, S.J., Blackwell, J.R., Skiba, P.F., Winyard, P.G., Jeukendrup, A.E., Vanhatalo, A., & Jones, A.M. (2013). Beetroot juice and exercise: pharmacodynamic and dose-response relationships. Journal of Applied Physiology, 115(3), 325–336. https://doi.org/10.1152/japplphysiol.00372.2013. Relevance: Within-subject dose-response RCT; ~8.4 mmol effective, exercise tested ~2.5 h post-ingestion. Basis for the dose and timing.
Regulatory & Safety Documentation
National Institutes of Health, Office of Dietary Supplements. Potassium: Fact Sheet for Health Professionals. NIH ODS Potassium Fact Sheet. Relevance: Confirms no U.S. Tolerable Upper Intake Level is established for potassium and provides adult Adequate Intake values.
U.S. Food and Drug Administration. Daily Value on the Nutrition and Supplement Facts Labels. FDA Daily Value guidance. Relevance: Source of the 4,700 mg potassium Daily Value; potassium is presented for nutritional context only, not as a blood-pressure or disease claim.
Manufacturing Quality Standards
Indena S.p.A. (Enovita® grape-seed extract). cGMP facility, Tours, France. Relevance: Water-only extraction; supply-chain traceability from a winemaking byproduct source.
NSF International. Certified for Sport Program. NSF Certified for Sport program. Relevance: NITRATE-IQ™ is not currently NSF Certified for Sport; certification has been applied for.
Evidence quality note: The underlying evidence is consistent in direction but limited in quality. In the Poon et al. (2025) umbrella review, 18 of 20 component reviews rated low or critically low on AMSTAR-2 and only 3 reported GRADE. In the Gao et al. (2021) meta-analysis, 3 of 73 trials were at low risk of bias and every pooled outcome was graded low or very-low certainty. Dietary nitrate is one of the better-supported performance ingredients, and it remains a small-effect, moderate-confidence intervention. All performance statements describe published research on the ingredient, not guaranteed product outcomes.
These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease. Individual results may vary.
Performance statements describe population-level effects observed across the cited research. Individual responses vary with training status, baseline dietary nitrate intake, and oral microbiome. Poon et al. (2025) note that several of the individual reviews they assessed reported more pronounced effects in recreationally active people than in highly trained athletes, with a possible ceiling effect; in Gao et al. (2021) the submaximal VO₂ subgroup pointed the same way, though the authors caution that interaction may be spurious.