Whole food vitamin C is shown to be more bioavailable and effective than synthetic vitamin C as ascorbic acid. Synthetic Vitamin C as Ascorbic acid is also not even real vitamin C; it has a completely different chemical structure then real Vitamin C from food. Ascorbic acid is also shown to have negative impacts on your health with long term use.
Plant-based vitamin C is the true molecular form of Vitamin C; plus it contains a natural complex of bioflavonoids, enzymes, and co-factors that aid in its absorption and utilization.