Methylcobalamin can nourish peripheral nerves. In clinical practice, methylcobalamin is mainly applied to the treatment of peripheral neuropathy, or megaloblastic anemia caused by vitamin B12 deficiency. Methylcobalamin is an endogenous vitamin B12, which is an essential vitamin for human body. Methylcobalamin can promote the generation and regeneration of myelin sheath of peripheral nerves, so if patients have numbness and pain of limbs or in the acute stage of facial neuritis, they can take methylcobalamin to repair the nerves and myelin sheath of patients and improve the symptoms of numbness and pain of limbs. Methylcobalamin can also treat anemia and other central nervous system pathologies, such as cerebrovascular disease that causes hemiplegia and numbness of the nervous system.