I started my Spirulina tablets and found that my body was de-toxing within a week or so. In the beginning I felt tired, there was lethargy, a small breakout on my face due but any of it was a small price to pay due to the fact that I was "cleaning up" something and getting all the missing minerals and antioxidants my body needed. After three weeks I felt fine ... more energy and clear, red breakout disappeared and I was more level-headed. A great organic product.