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https://pmc.ncbi.nlm.nih.gov/articles/PMC6054240/ Proton Pump Inhibitors, H2-Receptor Antagonists, Metformin, and Vitamin B-12 Deficiency: Clinical... There is clear evidence that proton-pump inhibitors (PPIs), H2-receptor antagonists (H2RAs), and metformin can reduce serum vitamin B-12 concentrations by... vitamin b 12 deficiency proton pump inhibitors h2 receptor antagonists https://pmc.ncbi.nlm.nih.gov/articles/PMC4725715/ Methylmalonic Acid and Homocysteine as Indicators of Vitamin B-12 Deficiency in Cancer - PMC Normal or high serum vitamin B-12 levels can sometimes be seen in a B-12 deficient state, and can therefore be misleading. High levels of Methymalonic Acid... vitamin b 12 deficiency https://www.vinmec.com/eng/tag/vitamin-b-12-deficiency-f7ec81fc Vitamin B-12 deficiency | Vinmec vitamin b 12 deficiency vinmec