Biotin is a B vitamin, also referred to as vitamin H or vitamin B7. While it is most commonly taken to support healthy hair, skin, and nails, biotin is also essential for your metabolic processes of fats and amino acids, production of fatty acids, and cell growth. Biotin processes most of the food that you ingest, including carbohydrates, proteins, and fats. That’s another good reason to make sure you have the proper levels of biotin in your body.