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Taking a proton pump inhibitor or other medications that reduce stomach acid for reflux or ulcers, as well as taking metformin for diabetes, can reduce absorption of B12 in food or supplements
doi:10.1002/jimd.12009
Certificate of Analysis and COA Documentation Reliable suppliers commonly provide: Certificate of analysis (COA) HPLC purity reports Batch-specific analytical testing Assay verification Research documentation A verified COA allows researchers to review analytical consistency and purity standards before beginning controlled laboratory applications
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