Vitamin B complex is a compounded preparation, which contains vitamin B1, vitamin B2, vitamin B6, niacinamide, calcium pantothenate and other ingredients. Generally, it can be supplemented for 3 months continuously, and if there is still a lack of B vitamins, it can be continued after 1 month of discontinuation. The B vitamins are water-soluble vitamins that remain in the body for only a few hours and need to be replenished daily. Usually you can eat more food rich in B vitamins, such as soybeans, mushrooms, potatoes, sweet potatoes, corn, etc., eat more fresh vegetables and fruits, drink less carbonated drinks, do not stay up late, avoid smoking and alcohol. In addition, vitamin B complex may cause gastrointestinal discomfort, fatigue, irritability and other symptoms if taken in excessive doses, and should not be taken at will, but should be used under the guidance of a professional doctor.