Natrol Biotin supports healthy luxurious hair, beautiful skin, and strong nails, in addition to energy production. A water-soluble B-complex vitamin, biotin is necessary for cell growth and the production and metabolism of fat into amino acids. Natrol Biotin provides 10,000 mcg to help ensure the daily need for this essential nutrient is met. 100% Drug Free! Maximum dose! Natrol makes this product in the U.S.A.!