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Vitamin B-12, one of many B-complex vitamins, called cyanocobalamin, is absorbed from the terminal part of the small intestine, called Ileum.It gets bundled with a protein made by the cells in the stomach called Intrinsic factor.The deficiency of this protein in certain persons, causes pernicious anemia. Pernicious anemia can also occur due to other reasons, such as gastrectomy(removal of stomach )or ileum or in certain chronic disease states,for example ,as in Crohn's disease, in which the inner lining of the ileum has been destroyed, thus not able to absorb the b-12 intrinsic factor complex.
B-12 plays important role in the proper functioning of the red blood cells and the nerve cells in the brain and peripheral nerves.
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17y ago

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