By comparison, oral B12 supplements are absorbed at roughly 1 to 5% in healthy adults, and even less if you have low intrinsic factor, atrophic gastritis, celiac disease, Crohn's, or a history of gastric bypass
Bowel adhesion and therapy with the stable gastric pentadecapeptide BPC 157, L-NAME and L-arginine in rats
HCG Diet is not just a random diet with no basis at all
RP References 1
Groups at higher risk of deficiency include older adults (due to reduced stomach acid production), vegans and vegetarians, people with pernicious anaemia or gastrointestinal disorders affecting absorption, and those taking certain medications such as metformin or proton pump inhibitors
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