Methylcobalamin is a kind of nerve-nourishing vitamin medicine. The main component of methylcobalamin is vitamin B12, and methylcobalamin is actually an oral preparation of vitamin B12. Under normal circumstances, vitamin B12 is an intramuscular injection preparation. Methylcobalamin is usually used in combination with vitamin B1 in the treatment of neurological diseases to play a very good role. For example, in the treatment of nerve injury caused by cerebrovascular accidents, methylcobalamin can be used together with drugs for the treatment of cerebrovascular vessels, such as Salvia, Ginkgo biloba and other drugs. If methylcobalamin is used to treat nerve injury caused by trauma, it should be used in combination with trauma drugs, such as bruising pills and Yunnan Baiyao capsules. Also, when methylcobalamin is used to treat peripheral neuritis caused by diabetes, it has to be used in combination with drugs for the treatment of diabetes in order to play a good role.