Silicea Beauty Gummies for hair, skin & nails 60's with vitamin c, biotin and zinc. Biotin contributes to the maintenance of normal skin and hair. / 2 Vitamin C contributes to the protection of cells from oxidative stress. Vitamin C contributes to normal collagen forma tion for the normal function of skin. / 1,2,3 Zinc contributes to the maintenance of normal skin, hair and nails.