The B vitamins are a group of water-soluble vitamins necessary for the body to participate in metabolism, generally in the form of coenzymes. Vitamin B is a general term for the B vitamins, containing vitamin B1, vitamin B2, vitamin B6, and vitamin B12, each of which is involved in key metabolic reactions in the body in the form of coenzymes. Vitamin B1 is an important component of coenzyme in glucose metabolism, which maintains the normal metabolism of carbohydrates and the normal activity of nerves; Vitamin B2 is involved in the body’s bio-oxidation and energy production, and improves the body’s ability to adapt to environmental stress. Vitamin B6 is a coenzyme of many enzyme systems in the body, with inhibition of vomiting, promoting development and other functions; vitamin B12 can promote the development and maturation of red blood cells. Vitamin B has many roles, if the body lacks vitamin B, the corresponding symptoms will appear, affecting their own health. Daily attention should be paid to diet, to ensure a balanced diet, to avoid malnutrition and lack of vitamins.