The B-complex vitamins are actually a group of eight vitamins, which include thiamine (B1), riboflavin (B2), niacin (B3), pyridoxine (B6), folic acid (B9), cyanocobalamin (B12), pantothenic acid and biotin. These vitamins are essential for the breakdown of carbohydrates into glucose (provides energy for the body). The breakdown of fats and proteins (which aids the normal functioning of the nervous system). Muscle tone in the stomach and intestinal tract, Skin, Hair, Eyes, Mouth and Liver