Biotin is an essential vitamin—meaning that your body needs this micronutrient to function properly. The biotin you consume helps your body turn the food you eat (protein, carbohydrates, and fat) into energy.
A handful of research studies have shown that biotin supplementation may help stimulate hair regrowth in people who have a clinical biotin deficiency or alopecia (hair loss). In people with temporary hair loss, studies have shown that supplements containing biotin significantly improved hair growth after 90 days.