Did you know your body doesn't naturally produce Biotin? In fact, it’s common for people with biotin deficiency to develop brittle nails, thinning hair and irritated skin Biotin has been shown to be an essential vitamin to help metabolize carbohydrates, fats, amino acids and improve hair, skin and nails. Nourish & Rejuvenate - Stress, genetics, diet, sleep and other factors affect your overall health. Biotin and Collagen provides your body with the nourishment it needs to help thicken hair, improve skin and strengthen nails. Not for resale on Amazon.