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Certain medications can decrease the absorption of orally consumed vitamin B 12, including colchicine, extended-release potassium products, and antibiotics such as gentamicin, neomycin and tobramycin. [108] Anti-seizure medications phenobarbital, pregabalin, primidone and topiramate are associated with lower than normal serum vitamin concentration.
Because vitamin B 12 absorption is a multistep process that involves the stomach, pancreas and small intestine, and is mediated by two carriers: Haptocorrin and intrinsic factor, and because Haptocorrin (transcobalamin I) binds to vitamin B 12, and Vitamin B 12 is acid-sensitive, when vitamin B 12 binds to Haptocorrin it can safely pass through ...
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.
Impaired absorption can also result from blind loop syndrome where an overpopulation of bacteria in the small intestine absorb the vitamin. [126] B 12 deficiency caused by Helicobacter pylori was positively correlated with CagA positivity and gastric inflammatory activity, rather than gastric atrophy. [130]
It primarily serves to protect cobalamin (Vitamin B12) from acid degradation in the stomach by producing a HC-Vitamin B 12 complex. Once the complex has traveled to the more pH-neutral duodenum, pancreatic proteases degrade haptocorrin, releasing free cobalamin, which now binds to intrinsic factor for absorption by ileal enterocytes.
Vitamin B12 deficiency causes symptoms like fatigue, poor memory, a swollen tongue, and canker sores. Skip to main content. 24/7 Help. For premium support please call: 800-290-4726 more ways to ...
MyKind Organics Vegan B12 Spray. Made with methylcobalamin and oodles of organic fruit and botanicals, one spray a day tastes like raspberries while delivering 500 micrograms of vitamin B12. Plus ...
Treatment using oral drugs is an easier option in management but the bioavailability of B12 is low. This is due to low absorption in the intestine, and breakdown by enzyme activity. Research continues to focus on the use of permeation enhancers or permeation absorbers in combination with the treatment.