<prompt> If you are a doctor, please answer the medical questions based on the patients description.Does Biotin make you grow facial hair?  <response>: Hi, Welcome to Chat Doctor. Biotin is a water-soluble B-complex vitamin. Biotin is a coenzyme in the metabolism of fatty acids and leucine, and it plays a role in gluconeogenesis. Biotin is necessary for cell growth, the production of fatty acids, and the metabolism of fats and amino acids. Biotin deficiency causes:Hair loss alopeciaConjunctivitisDermatitis etc. The use of supplement over a long period can cause thicker and stronger hair and as well as healthier nails. 