Antioxidant vitamin widely used (both internally and topically) in the treatment of acne and other skin conditions. Its topical application promotes the formation of new skin cells and helps regulate oil secretion in the sebaceous glands. Particularly beneficial for dry or sun-exposed skin, it is often found in sun protection creams for its antioxidant properties and its soothing and hydrating effect on the skin. (A deficiency of vitamin A in the body reduces the mucopolysaccharides in the skin, which accelerates the skin's aging process.) Also used as a natural preservative in cosmetics.