Vitamin B7 is a water-soluble vitamin part of the group of essential nutrients known as the B Complex. Vitamin B7 is known as the “beauty vitamin” as it helps promote healthy skin, nails, and hair. Vitamin B7 is vital for a healthy nervous system, psychological wellbeing, and blood sugar balance. Vitamin B7 also supports energy metabolism in the body and is required for protein, carbohydrate, and fat metabolism.