Vitamin C Ascorbic Acid is an important every day essentialin building up the bodys defences against colds and flu. Vitamin C also known as, ascorbic acid, L-ascorbic acid, dehydroascorbic acid, the antiscorbutic vitamin, L-xyloascorbic acid and L-threo-hex-2-uronic acidy-lactone. Itis a much talked about vitamin, with people claiming it as a cure-all for may diseases and problems - from cancer to the common cold. The human body is unable to produce its own source of Vitamin C and therefore it is essential to take a vitamin C supplement. 1 teaspoon of Pure Ascorbic Acid powder is the equivalent to approx 5g.