Mecobalamin is endogenous vitamin B12. It is present in blood and myeloid fluid. Compared with vitamin B12, it has a good effect on improving neuronal conduction. It can promote nucleic acid-protein through methyl conversion reaction. Fat metabolism, as a coenzyme of methionine synthase, can convert homocysteine to methionine, participate in the process of deoxynucleoside synthesis of thymine, promote nucleic acid and protein synthesis, promote intra-axonal transport and axis Regeneration of cord and formation of myelin sheath prevent axonal degeneration and repair damaged nerve tissue.