The B vitamins and Vitamin C are 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 nervous system relies on the presence of the B group vitamins for the production of hormones and neurotransmitters.

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 vitamin B1 and folic acid. Stress of all kinds, including emotional stress and overindulgence, increases the excretion of vitamin C from our bodies and therefore raises our need for this vitamin. Studies indicate that vitamin C intake benefits the body in numerous ways, including providing an antioxidant role against contaminants such as pollution and cigarette smoke.