Vitamin B, also known as Vitamin B Complex, is mainly used for the prevention and treatment of malnutrition and other diseases caused by B vitamin deficiency. Vitamin B complex is a compound preparation of several B vitamins, mainly used for the prevention and treatment of malnutrition caused by B vitamin deficiency, beriberi, pellagra and other diseases. Because B vitamins are water-soluble vitamins, most of them can be excreted through urine when consuming excessive amounts of vitamin B complex, so generally no significant adverse reactions will not occur. If a large amount of oral intake in a short period of time, it may cause itching of the skin, poor appetite, irritability, yellow urine, and other adverse reactions, which can be subsided quickly by drinking plenty of water to promote excretion. B vitamins in the cereal food content is high, so, if there is usually no picky eating habits, generally will not occur B vitamin deficiency phenomenon, if there is a suspicion of B vitamin deficiency, should be timely to the hospital, under the guidance of the physician to give targeted intervention therapy.