There could be several causes behind this condition, like prolonged exposure to toxic chemicals, viral infections, inherited disorders, undergoing cancer treatment, and taking certain medicines
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In the small intestine, detached from the R binder protein, the free B 12 binds to intrinsic factor from the stomachs parietal cells, allowing for absorption in the terminal ileum [33]
[DOI] [PubMed] [Google Scholar] 292.Fiske KE, Isenhower RW, Bamond MJ, Delmolino L, Sloman KN, LaRue RH