B complex vitamins include the common B vitamins, like vitamin B1, vitamin B2, and vitamin B6. Because of the complex composition of B vitamins, their effects on nerve nutrition, nerve conduction, hematopoiesis, and glucose metabolism are very evident when they are used as a compound. Because vitamin B is still relatively diverse from food sources, deficiencies are generally less likely to occur. If the problem of partial diet, or food sources out of the question, resulting in B vitamin deficiency, the patient mainly appeared corns, mouth ulcers, or diabetic patients appear neuropathy of the hands and feet, then it is recommended to supplement vitamin B complex.