Generally speaking, taking one B vitamin a day will not have a significant impact on the body, but it is not recommended to take a large amount for a long period of time, you need to strictly follow medical advice on the use of drugs, do not take it on your own, so as not to increase the burden on liver and kidney function. Vitamin B is a class of water-soluble vitamins, which is one of the essential nutrients for human body. As coenzymes of various enzymes in the body, they participate in the metabolism of fats, proteins and sugars in the body, accelerate the release of energy, help the body to replenish the necessary nutrients, delay fatigue, reduce stress, promote digestion, and maintain the function of the systems are helpful. It is recommended to supplement B vitamins through a balanced diet, such as cereals, meat, fresh vegetables, fruits, animal liver, etc. However, for pregnant or lactating women, as well as people suffering from cancer, Crohn’s disease, hypothyroidism, anorexia and other diseases prone to vitamin B deficiency, oral B vitamins can be supplemented under the guidance of a doctor according to the required dose. If symptoms of oversupplementation such as dizziness, panic, facial swelling, skin flushing, itching, etc. occur during supplementation, it is recommended to stop taking it in time, pay attention to increase water intake to promote the excretion of B vitamins, and seek medical consultation if symptoms are obvious or do not ease for a long time.