L-Ascorbic Acid as Vitamin C Pharmaceutical Grade Powder A high purity Vitamin C Powder for dietary supplement and antioxidant use. What is L-Ascorbic Acid Powder? L-Ascorbic Acid is a natural water-soluble vitamin (Vitamin C). L-Ascorbic acid is a potent reducing and antioxidant agent that functions in fighting bacterial infections, in detoxifying reactions, and in the formation of collagen in fibrous tissue, teeth, bones, connective tissue, skin, and capillaries. It is found in citrus and other fruits, and also in many vegetables. Vitamin C is not produced by the body and cannot be stored so must be obtained through diet or dietary supplementation. Directions How much do I use? Add ¼ teaspoon (1g) to a drink, shake or 50ml of water up to 3 times a day. Do not exceed recommended daily dose.