Common foods containing vitamin b 12 include animal liver, kidney, beef, pork, chicken, fish, clams, eggs, milk, cheese, dairy products and fermented bean curd. Because vitamin b 12 can effectively prevent the occurrence of many diseases, vitamin b 12 supplement can improve the body's immunity and reduce the occurrence of diseases.

Vitamin B 12 is mainly herbivores in rumen and colon synthesized by bacteria in nature. Therefore, its dietary source is mainly animal food, in which animal viscera, meat and eggs are rich in vitamin B 12. Fermented bean products will produce some vitamin B 12. Human intestinal bacteria can also be involved.

The function of B 12 has no effect on preventing Alzheimer's disease, so it cannot prevent Alzheimer's disease.

Extended data

Effect of vitamin B 12

1, promote methyl ester. Promote the development and maturity of red blood cells, maintain the normal hematopoietic function of the body, prevent pernicious anemia and maintain healthy nerves.

2. In the form of coenzyme, it can increase the utilization rate of folic acid and promote carbohydrate, fat and protein.

3. Activating the role of amino acids and promoting the biosynthesis of nucleic acids can promote the synthesis of protein, which plays an important role.

4, metabolism of fatty acids, so that fat, carbohydrates and protein can be used correctly by the body. Eliminate irritability, concentrate, enhance memory and balance. It is an indispensable vitamin for healthy nervous system and participates in the formation of lipoprotein in nervous tissue.

Baidu Encyclopedia-Vitamin B 12