The B vitamins are a group of water-soluble vitamins commonly found together in foods. The B group vitamins play an essential role in the metabolic processes of all living cells by serving as coenzymes in the metabolism of carbohydrates, proteins and fats to produce energy. Also, the normal function and maintenance of the body relies on the presence of the B group vitamins.
Water soluble vitamins are not stored by the body in large amounts, therefore regular consumption of these vitamins in the diet is necessary. Various situations may increase the need for the B vitamins above that which can be provided by a normal diet. For example, stress increases the requirements for the vitamin B group. Overindulgence in alcohol can also affect the absorption and use of the B group vitamins, especially B1 and folic acid.