The B vitamins are a group of water-soluble vitamins that the body requires for a number of functions. There are eight B vitamins - B1 (thiamin), B2 (riboflavin), B3 (niacin), B5 (pantothenic acid), B6 (pyridoxine), B7 (biotin), B9 (folate or folic acid) and B12 (cobalamin). Each one has slightly different