Biotin, also known as vitamin B7, is a water-soluble B-complex vitamin. It is essential for the metabolism of fats, carbohydrates, and amino acids, and it plays a role in the production of hormones and the maintenance of healthy skin, hair, and nails. Biotin can be found in a variety of foods, including egg yolks, nuts, and legumes, and it is also available as a dietary supplement. Biotin deficiency could lead to hair loss, dry skin, and brittle nails. Supplementing with biotin may help improve the health and appearance of hair, skin, and nails.*