Vitamin B usually refers to the vitamin B family, which is an indispensable nutrient in human tissues, mainly including vitamin B1, vitamin B2, vitamin B6, vitamin B12, pantothenic acid, folic acid, niacin, etc. It is a class of water-soluble vitamins that are involved in various metabolisms in the body. Usually, if the body is deficient in vitamin B, it can be appropriately supplemented, but generally taken continuously for no more than 3 months, and may have adverse consequences if insisted on eating for 1 year. If there is vitamin B deficiency, which can be manifested as fatigue, weakness, muscle atrophy, loss of appetite, constipation, diarrhea and many other clinical symptoms, it can be supplemented to help meet the normal needs of the body and maintain the nerve conduction function, heart function and gastrointestinal function of the body. However, if insisted on taking it for a year, it can lead to oversupplementation of vitamin B, thus creating a certain dependence, and patients are more likely to have abnormalities in the nervous system, digestive system and urinary system, which may cause dizziness, headache, nausea, vomiting, diarrhea, decreased appetite, edema, headache and blurred vision. In general, the average person’s daily intake of fresh vegetables, fruits, whole grains and other foods is sufficient to meet the daily needs of the body, no special supplementation is necessary. If you suffer from vitamin B deficiency or insufficiency, you should take reasonable vitamin B supplements under the guidance of a professional doctor or nutritionist, and pay attention to the adjustment of dietary structure, try to take in from the diet, not just take vitamin B supplements to supplement the lack of nutrients in the body, so as not to be detrimental to long-term health.