Biotin is a water-soluble vitamin that is part of the B-complex group of vitamins. It is also known as vitamin H or coenzyme R. Biotin is involved in the metabolism of carbohydrates, fats, and proteins. It is also essential for the health of the skin, hair, and nails.

Biotin is often used as a supplement to treat biotin deficiency. It is also used as a cosmetic treatment for brittle nails and hair loss.

Biotin is available in supplements, topical treatments, and injectable forms. It can also be found in food sources, such as eggs, nuts, and seeds.

Biotin is generally considered safe when taken in recommended doses. Some side effects, such as dizziness, rash, and digestive upset, have been reported.

Biotin is an important vitamin for hair health. It helps to build keratin, which is the protein that makes up hair. Biotin can also help to prevent hair loss.