Simply Nutra Biotin 10000mcg promotes healthy hair, skin and nails. It supports skin rejuvenation, protection and health. Biotin is a water-soluble B vitamin that is involved in the metabolism of protein, fats and carbohydrates. It also helps support healthy hair, skin and nails. This essential B vitamin is one of the only natural vitamins backed with study data to show significant signs of hair growth in people with deficiencies. A 10000 mcg dose of biotin can help promote healthy hair, skin, and nails. Keratin helps support the structural integrity of hair, skin and nails.