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Evidence level: Contradicted by the cited record Sources: Development & validation of LC-MS/MS assay for 5-amino-1-methyl quinolinium in rat plasma: Application to pharmacokinetic and oral bioavailability studies., ClinicalTrials.gov exact-name search, accessed 2026-07-12 How to read this: Rat bioavailability does not validate a human formulation

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The deficiency of vitamin B12 can begin mildly and progress to severe side effects, impairing brain and nerve function