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Gao et al
Small intestine conditions such as celiac disease, Crohns disease, parasite or bacterial growth
The body's capacity to absorb B12 from food is naturally limited by intrinsic factor, a protein produced in the stomach that binds to B12 and facilitates its absorption in the small intestine
Does B12 Boost Your Metabolism
Then theres other evidence such as where tablets have been introduced to treat patients with Pernicious Anaemia doctors still keep on prescribing the injections and anyway, patients are easily able to purchase injectable B12 from other sources and treat themselves
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