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[DOI] [PMC free article] [PubMed] [Google Scholar] Chen D

The best B12 injection schedule depends on your health needs and how you react to the treatment

The honest position is this: there is no head-to-head human bioavailability trial telling you which route is superior for this specific molecule, so the best route is not a settled question

doi:10.1073/pnas.050909910
