How does biotin help hair growth? Your hair is made of keratin, which is a type of protein. Proteins are built from amino acids, which are formed as a result of the reaction of cell enzymes and biotin. Biotin is used primarily for alopecia (hair loss) in men or women. “It improves hair growth and helps with inflammation. The hair follicle, the skin and the nails all benefit. The biotin in your body contributes to the production of healthy hair and nails, by providing an essential ingredient in the process of hair growth.