Abstract
Summary: Vitamin B12 (cyanocobalamin) is part of the B vitamins, which are essential for the proper functioning of metabolism. Of these, vitamin B12 plays one of the most important roles in the human body.
At the body level, it is important for blood formation, the proper functioning of the nervous system and is also involved in the synthesis of our DNA. Vitamin B12 deficiency is manifested by anemia, weakness, fatigue or various neurological problems, but also shortness of breath, loss of taste, smell and weight, impotence, mental instability.
Its deficiency can accompany chronic atrophic gastritis (the gastric mucosa does not form the so-called internal factor, necessary for the absorption of vitamin B12). Pernicious anemia with large erythrocytes (megaloblastic anemia) develops.