Vitamin B complex belongs to water-soluble vitamins, and there are various dosage forms in the market, but tablets are the most common, usually containing vitamin B1, vitamin B2, vitamin B6, nicotinamide, calcium dextro-pantothenate and other ingredients, as well as starch, dextrin, tartaric acid and other excipients, which belong to a kind of complex preparation. Vitamin B complex tablets are mainly used for the treatment and prevention of clinical symptoms caused by B vitamin deficiency, such as malnutrition, anorexia, seborrheic dermatitis, acne, mouth ulcers, keratitis, beriberi, pellagra and other diseases. Since vitamin B plays an important role in the bioavailability of sugar, fat and protein, helping to complete many of these enzymatic reactions, and also plays an important role in promoting human metabolism, nourishing nerves and hematopoiesis, etc. Therefore, people who lack various vitamin B should take timely supplements of vitamin B complex, which can effectively prevent various diseases in the body. A balanced diet in daily life can usually meet the body’s needs for vitamins, without the need for extra drugs. Common foods rich in B vitamins include animal liver, milk, vegetables, fruits, cereals and so on. If the deficiency is mild, such as occasional mouth ulcers, corns, etc., it can be supplemented by consuming more B vitamin-rich foods on a daily basis, or by taking B complex tablets for a short period of time under the guidance of a doctor. However, long-term overdose is not recommended, because long-term overdose may lead to abnormal vitamin metabolism, and some patients may experience irritability, fatigue, loss of appetite and other adverse reactions, and a few patients may be accompanied by skin flushing, itching, yellow urine and other symptoms. So take the drug under the guidance of a professional doctor to avoid taking the drug without permission and affecting your health.