Vitamin B family includes vitamin B1 (thiamine), vitamin B2 (riboflavin), vitamin B3 (niacin), vitamin B5 (pantothenic acid), vitamin B6 (pyridoxine), vitamin B7 (biotin), vitamin B9 (folic acid), vitamin B12 (cyanocobalamin), etc., which are mostly related to various biological oxidation and enzymatic activities in the body, and therefore are very important for the normal function of the body. Among them, diseases caused by deficiency of vitamin B1, vitamin B2, vitamin B6, vitamin B9 and vitamin B12 are mostly seen clinically, so they are highlighted: I. Benefits of vitamin B group: 1. Vitamin B1: has an important role in biological oxidation and nutrient metabolism in the brain, and can maintain a normal mental state, so it is also known as a mental vitamin. Vitamin B1 deficiency can easily cause foot disease, etc.; 2. Vitamin B2: involved in biological oxidation and the body’s energy metabolism, such as the metabolism of sugar, fat, protein, etc. It is a nutrient necessary for cell growth and can promote cell regeneration, thus maintaining the normal growth of the body. Vitamin B2 deficiency can easily lead to metabolic disorders in the organism, with the appearance of stomatitis, linguitis, seborrheic dermatitis, conjunctivitis, etc.; 3. Vitamin B6: It is a coenzyme for many important enzymatic reactions in the organism, which can relieve the symptoms of vomiting, and has certain therapeutic effects for pregnant women and people with motion sickness, etc. In addition, vitamin B6 can also be applied to prevent fatty liver, allergies, neurodermatitis, etc. Lack of vitamin B6 can easily cause anemia, seborrheic dermatitis, tongue inflammation, etc.; 4. Vitamin B9: very important for early pregnancy, can prevent fetal neurodevelopmental malformations, it is recommended to follow medical advice to supplement during pregnancy preparation and early pregnancy; 5. Vitamin B12: can promote the development and maturation of red blood cells and prevent megaloblastic anemia. It can also reduce irritability and other negative emotions, maintain nerve function, promote protein synthesis, and assist in child development. Second, the side effects of vitamin B: large doses of vitamin B can appear irritability, fatigue, loss of appetite and other symptoms, in addition to occasional adverse skin reactions, such as itching, flushing, etc.. In addition, as most of these drugs are yellow preparations, they tend to cause yellow urine. Therefore, it is recommended to use the medication under the guidance of a doctor, do not use the medication at your own discretion to avoid harming your health.