B vitamins are essential nutrients for the human body, for people with insufficient vitamin intake in the diet can take vitamin B for a long time, but the intake needs to be controlled at the minimum maintenance amount. B vitamins are indispensable nutrients for the human body, and play an important role in maintaining the normal physiological metabolism of the human body. Various fresh vegetables, fruits, and meat, fish rich in vitamin B, most of the B vitamins can be obtained from the usual diet. Most of the b vitamins can be obtained from the regular diet. Vitamin b deficiency can be caused by partial eating or dieting, or by the inability to obtain fresh food due to conditions, as well as prolonged vomiting and diarrhea, which, if not corrected, may require prolonged supplementation. Prolonged supplementation of vitamin B needs to be taken under the supervision of a doctor and in accordance with the doctor’s instructions. It is best for normal people to take the lowest possible dose of vitamin B orally if they want to take it for a prolonged period of time. Prolonged overdose of vitamin B can lead to accumulation of vitamin B in the body, dizziness, blurred eyes, skin flushing, nausea and other adverse reactions.