Methylcobalamin is not glutamine. Methylcobalamin and glutamine are two different drugs. Methylcobalamin is mainly used to nourish peripheral nerves in clinical practice, and can treat numbness and pain of limbs, such as peripheral neuritis caused by diabetes, or peripheral nerve damage due to long-term heavy alcohol consumption, and can also treat facial paralysis. Glutamate can adjust the function of plant nerves, which is mainly applied to patients with neurological weakness, premenstrual tension disorder and autonomic dysfunction, manifested as cardiac neurosis, gastrointestinal neurosis with insomnia and other symptoms, which can be adjusted by glutamate. In addition to the nutritional effect of vitamin B12, methylcobalamin combined with folic acid can treat hyperhomocysteinemia, so it is more widely used in clinical practice.