Vitamin C by Complementary Prescriptions  Vitamin C (ascorbic acid) is an essential nutrient. Because it is water-soluble and dietary intake varies, regular supplementation is important. As an antioxidant, vitamin C works at the cellular level to reduce the adverse effects of oxidation and premature aging. Since it is involved with the production of collagen and connective tissue, vitamin C helps maintain functional and strong connective tissue, blood vessels and capillaries, as well as healthy skin and gums. It also promotes healing and can reduce bruising. Vitamin C has also been shown to support immune and adrenal function, as well as reduce allergic response. Vitamin C from Complementary Prescriptions delivers pure ascorbic acid in a vegetarian capsule.