It is a formula made for hair. Biotin, selenium and zinc contribute to the maintenance of normal hair. It has nails, selenium and zinc contribute to the maintenance of normal nails. To provide you with normal skin: Vitamin C contributes to the normal formation of collagen for normal skin function. Vitamin A, biotin, niacin and zinc contribute to the maintenance of normal skin. Cell Protection: Vitamin C, Selenium, and Zinc help protect cells against unwanted oxidation. It is recommended to take 1 tablet twice a day, preferably after meals.