Biotin formula provides you with a maximum strength of 10,000 mcg per tablet. An essential B vitamin which aids in cell growth, fatty acid production, the metabolism of carbohydrates, fats, and proteins, and in the utilization of other B-complex vitamins. Maintain healthy hair, skin & nails. Supports Metabolism. For additional formula information, view the Supplement Facts panel. All Windmill supplements are manufactured in the United States in an FDA-inspected facility whose cGMP (current Good Manufacturing Practice) are independently verified by qualified certification organizations. Free of artificial colors, flavors and preservatives, Windmill is a trusted name that has been providing America with quality supplements for over 45 years.