Vitamin B6 is a water-soluble vitamin part of the group of essential nutrients known as the B Complex. Vitamin B6 is vital to nervous system health and hormonal balance. Vitamin B6 supports the function and growth of red blood cells and helps convert carbohydrates, fats, and proteins into energy. Vitamin B6 also supports the production of serotonin and dopamine and may provide support for premenstrual symptoms.