This Vitamin C Assay Kit measures total vitamin C (AsA + DHAsA).Vitamin C (L-Ascorbic acid) is water-soluble vitamin with strong reducing action and is an important coenzyme for internal hydroxylation reactions (e.g. collagen). Vitamin C is found in both reduced form (ascorbic acid (AsA)) and oxidized form (dehydroascorbic acid (DHAsA)). This Vitamin C Assay Kit measures total vitamin C (AsA + DHAsA). The method of this kit is a refinement of the colorimetric assay described by Daniel (1973).