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[DOI] [PMC free article] [PubMed] [Google Scholar] 11.Head K.A

Reduced secretion of gastric acid and pepsin, from the use of H 2 blocker or proton-pump inhibitor (PPI) drugs, can reduce the absorption of protein-bound (dietary) vitamin B 12 , although not of supplemental vitamin B 12

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BPI can be preganglionic or postganglionic, and the level of injury determines the appropriate treatment method or prognosis 3
