Vitamin B12, also known as cobalamin, is a water-soluble vitamin, is the only vitamin found so far that contains metal elements, vitamin B12 in nature are synthesized by microorganisms, and its absorption in the human body needs the help of internal factors (a protein) secreted by the cells of the gastric lining, so people with gastrointestinal tract dysfunction are prone to a decrease in the secretion of internal factors, which can induce Vitamin B12 absorption is impaired, leading to vitamin B12 deficiency. Vitamin B12 is widely found in animal liver, salmon, beef, chicken, eggs, grains, soybeans and other foods, and can be stored in the liver after intake. The human body's demand for vitamin B12 is extremely low, and those who are able to eat a normal diet will not be deficient in vitamin B12.

Vitamin B12 exists in the human body in the form of coenzymes, which not only can be involved in protein, fat and carbohydrate metabolism, improve the utilization of the three major nutrients, but also can promote the utilization of folic acid and protein synthesis, vital to human growth and development. In addition, vitamin B12 also plays an irreplaceable role in the process of red blood cell development and maturation, maintaining the normal hematopoietic function of the human body. What's more, vitamin B12 is also a vitamin necessary for maintaining sound nervous system function, which promotes the synthesis of a lipoprotein in the nervous system and improves the metabolism and function of the nerve myelin sheaths, thus enhancing the human body's sense of balance, strengthening memory and concentration

In the clinical setting, it is important that you have a good sense of balance, memory, and concentration.

In clinical practice, vitamin B12 has four main uses, first, vitamin B12 can correct anemia, relieve fatigue, fatigue, pale skin, loss of appetite, palpitations, shortness of breath and other symptoms of anemia, mainly used in the treatment of megaloblastic anemia; second, vitamin B12 can assist in the treatment of peripheral neuritis, effective relief of neuralgia, numbness, *** Jejuni disorders and other symptoms; again, vitamin B12 is involved in homocysteine, which is the most common type of cysteine. B12 is involved in the metabolic process of homocysteine, which helps to reduce blood homocysteine levels, preventing coronary heart disease, stroke and other cardiovascular diseases; finally, long-term use of metformin in diabetic patients can be vitamin B12 deficiency, which is related to metformin inhibition of small intestinal absorption of vitamin B12, which can be combined with the vitamin B12 for treatment.

While the human body can not lack vitamin B12, but some people should avoid the use of vitamin B12, such as patients with Leber's disease (a kind of family hereditary optic neuritis and amblyopia), to the serum of vitamin B12 abnormally elevated as the main feature, this kind of patients if the use of vitamin B12, can lead to the optic nerve atrophy rapidly aggravated; neurological damage to the patient should also be banned vitamin B12, because the use of vitamin B12 in these patients may lead to aggravation of the condition, but also may mask the condition, affecting the diagnosis and endangering life; vitamin B12 can accelerate the degradation of nucleic acids and elevate blood uric acid, therefore, patients with gout should be prohibited from using vitamin B12; vitamin B12 is easy to cause hypokalemia during the initial treatment, therefore, patients with hypokalemia should be prohibited from using vitamin B12.