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Metformin (for diabetes), proton pump inhibitors (such as omeprazole or esomeprazole), and H2 blockers (such as famotidine) can all reduce B12 absorption over time
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doi: 10.1016/j.cell.2011.11.016 81 ThieryJP
While peptide therapy may be appropriate for some individuals, it is not necessarily suitable for everyone
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