Vitamin B12 is an essential vitamin in the metabolism of human tissues. The average amount of vitamin B12 in the human body is 2-5mg, of which 50-90 is stored in the liver and released into the blood to form red blood cells when the body needs to. Long term deficiency of B12 can lead to pernicious anemia. B12 and folic acid are important enzymes in the process of cell synthesis of nucleic acid. They are involved in the synthesis of purine, pyrimidine, nucleic acid and methionine. They can transfer methyl group and promote the synthesis of base. At the same time, they can increase the synthesis of glycogen, thus eliminating liver fat. It is often used as a drug to treat liver disease. The human body needs about 21 micrograms of vitamin b121 a day, and 2 micrograms of vitamin b121 can be provided in food every day to ensure normal needs.

Vitamin B12 is a coenzyme of the biochemical reaction in cells. When vitamin B12 is deficient, the result is the same as that of folic acid deficiency. In addition, vitamin B12 deficiency, there are symptoms of nerve damage.

Clinically, it is mainly used for the treatment of pernicious anemia and other megaloblastic anemia, as well as the adjuvant treatment of neurological diseases (such as neuritis, nerve atrophy, neuralgia, etc.), liver diseases, leukopenia, aplastic anemia and other diseases.