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Vitamin B 12 is absorbed by a B 12-specific transport proteins or via passive diffusion. [12] Transport-mediated absorption and tissue delivery is a complex process involving three transport proteins: haptocorrin (HC), intrinsic factor (IF) and transcobalamin II (TC2), and respective membrane receptor proteins. HC is present in saliva.
In pigs it is obtained from the pylorus and beginning of the duodenum; [12] in human beings it is present in the fundus and body of the stomach. [13] The limited amount of normal human gastric intrinsic factor limits normal efficient absorption of B 12 to about 2 μg per meal, a nominally adequate intake of B 12. [14]
One of the superpowers of vitamin B12 is that it is the only water-soluble vitamin that can be stored in the human body, Kitchens points out, and it can remain stored in the liver for several years.
Vitamin B 12 cannot be produced by the human body, and must be obtained from the diet. [2] The body normally gets enough vitamin B 12 from the consumption of foods from animal sources. [2] Inadequate dietary intake of animal products such as eggs, meat, milk, fish, fowl (and some types of edible algae) can result in a deficiency state. [135]
Vitamin B12 plays a particularly important role in creating red blood cells, which transport oxygen throughout the body, and DNA.
The same cells in the stomach that produce gastric hydrochloric acid, the parietal cells, also produce a molecule called the intrinsic factor (IF), which binds the B 12 after its release from haptocorrin by digestion, and without which only 1% of vitamin B 12 is absorbed. Intrinsic factor (IF) is a glycoprotein, with a molecular weight of 45 kDa.
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