Natrol Biotin 10,000mcg is a maximum strength formula that provides dietary support for healthy hair and nails, as well as energy production. By supporting the matrix of hair and nails, Biotin promotes shiny, lustrous hair and strong, resilient nails. Biotin asssists in energy production by helping convert the carbohydrates, proteins and fats that we consume from our diets into energy for our cells. *Supports Cellular Energy Production *Maximum Strength - 10,000mcg *100% Vegetarian.