Nature Made Biotin 1000 mcg Softgels contain biotin, which supports the metabolism of carbohydrates, protein and fats. Biotin is part of the family of B vitamins and is also known as vitamin B7. Nature Made Biotin 1,000 mcg Softgels contain biotin, which supports the metabolism of carbohydrates, protein and fats. Biotin is part of the family of B vitamins and is also known as vitamin B7.