Usually vitamin B complex refers to the B vitamins, including vitamin B1, vitamin B2, vitamin B, vitamin B4, vitamin B6, folic acid, vitamin B12, etc. The role of vitamin B complex is as follows: First, it promotes metabolism in the body, metabolizes sugar, fat and protein, carries out organic transformation into calories while increasing the body’s immunity and maintains cellular functions. Second, vitamin B can treat and prevent certain diseases. Vitamin B1 deficiency can lead to foot disease, and vitamin B2 and B6 deficiency can lead to mouth ulcers, conjunctivitis, keratitis, etc. Therefore, vitamin B has the role of preventing mucosal infections and ulcers. Third, vitamin B also has a good stabilizing effect on the cardiovascular and cerebrovascular, especially folic acid, which can play a role in maintaining the balance of the endothelial cells of the cardiovascular and cerebrovascular. Fourth, B vitamins can also maintain the immunity of the body and enhance the body’s resistance to disease.