Biotin (vitamin B7, H or B8) is a vitamin needed in the metabolism of proteins, fats and carbohydrates, and is essential for converting food into energy. It is also one of the vitamins that most influences hair and nail growth and helps to keep the skin in good condition. Biotin promotes the growth of rapidly reproducing tissues, helping to make them more elastic. In the case of hair, this results in a stronger, more flexible mane. Biotin in hair cosmetics helps stimulate blood circulation in the scalp, for longer, healthier hair growth. It also helps to keep a balanced scalp pH, which reduces the production of sebum or dandruff, resulting in healthier, shinier hair.