Natural Factors Biotin promotes strong, healthy nails, hair, and skin. Biotin is a B-complex vitamin (B7) that is vital for the metabolism of carbohydrates, fats, and proteins, helping to convert food into energy. It also supports healthy blood sugar regulation. Natural Factors non-GMO biotin is available in 1000 mcg and 5000 mcg capsules. Reg. price $11.48