Hair, Skin & Nails: Biotin contributes to the maintenance of normal hair and skin. Zinc contributes to the maintenance of normal hair, skin and nails. 
Selenium contributes to the maintenance of normal hair and nails.
Collagen Formation: Vitamin C contributes to normal collagen formation for the normal function of skin.
Oxidative Stress: Zinc, selenium and vitamin C contribute to the protection of cells from oxidative stress.