Biotin, also called B7, is part of the family of B vitamins. The vitamin is crucial for metabolism regulation and function of the nervous system. The nutrient is also essential for healthy hair, skin, and nails. Besides healthy hair, skin, and nails, biotin plays a role in blood sugar regulation. Some evidence has shown that the supplement can help to lower blood sugar in patients with type 2 diabetes. Biotin is also crucial for pregnant women to prevent birth defects and maintain the health of the mother.