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Description
That's not a failure of B12 that's how targeted nutrition works

Whats more, most oral supplements arent as effective as were led to believe

An economic model of the costsaving potential from increased utilisation of oral versus intramuscular vitamin B12 maintenance therapy for Alberta seniors (Provisional abstract)

There is no single correct approach

[DOI] [PubMed] [Google Scholar] 143.Zhang J, Hupfeld CJ, Taylor SS, Olefsky JM, Tsien RY

doi: 10.1177/20503121241253957, 5
