Vitamin B1 will whether to increase immunity is not supported by scientific theory. However, vitamin B1 is a kind of vitamin, can promote the maturation of lymphocytes, and then maintain the immunity of the body, at the same time, its biggest function is to promote the development of the nervous system, so as to effectively prevent and control the occurrence of beriberi. Vitamin B1 belongs to the vitamin class of drugs, the main role can promote the normal development and functioning of the nervous system, can promote the development of the brain, for the prevention of beriberi has a certain auxiliary effect. If the body is seriously deficient in vitamin B1, it will be easier to form foot fungus, or peripheral neuritis, and also accompanied by poor appetite, fatigue, nausea and other adverse symptoms. At the same time, vitamin B1 is also able to promote the maturation of lymphocytes, which can promote the maturation of lymphocytes, which in turn, to some extent, can maintain the immunity of the organism. Vitamin B1 is used in accordance with the normal dosage of the drug and usually has no side effects. Then if overdose may cause headache, loss of appetite, fatigue, swelling and other adverse reactions. In addition, for pregnant women, lactating women, the elderly, children and other groups of people cautious self-application, need to be used under the guidance of a doctor.