B vitamins are a group of water-soluble compounds that your body cannot produce or store. The B vitamins include Thiamin (B1), Riboflavin (B2), Niacin (B3), Pantothenic acid (B5), Pyridoxine (B6), Folic acid (B9), and Cobalamin (B12). B vitamins work closely together to regulate health and various biological processes in your body, including energy production, and some help cells multiply through their role in DNA production.