Vitamin of B12 (цианокобаламин) 2936260000
Vitamins B12 is a group of cobalt-containing biologically active substances called cobalamins.
These include cyanocobalamin itself - a product obtained during the chemical purification of vitamins with cyanide, hydroxycobalamin and two coenzyme forms of vitamin B12: methylcobalamin and 5-deoxyadenosylcobalamin.
Neither animals nor plants are capable of synthesizing vitamin B12. It is the only vitamin synthesized almost exclusively by microorganisms: bacteria, actinomycetes and blue-green algae. Of the animal tissues, the liver and kidneys are the richest in vitamin B12. Although this vitamin is produced by microorganisms in the digestive tract of any animal, including humans, as a product of microflora activity, however, it cannot be absorbed, since it is formed in the large intestine and cannot enter the small intestine. Therefore, a person gets vitamin B12 mainly from animal food, including meat, fish, eggs and dairy products.
A source of cobalamins can also be foods fortified with them: for example, for vegetarians and vegans such a source is breakfast cereals, brewer's yeast and nutritional yeast artificially fortified with vitamin B12; fortified flakes and crushed grain products, as well as special additives. In the food industry of many countries, vitamin is added to such products, exceeding the concentration of which leads to damage to the nervous system and an increased risk of cardiovascular diseases.
Consumption rate .
Minimum daily the norm is 3 mcg. Even if we eat very little meat, milk and eggs, we give the body about 15 micrograms of cyanocobalamin.
|Minimum daily norm||3 mcg.|