how vitamin b12 injections work What Are Injections? And Are They Safe? B-12 (Methylcobalamin) Therapy | MedClub
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Gastrointestinal surgery can also affect B12 absorption

Conversely, pregnancy, oral contraceptive use, and paraproteinaemia may cause assay interference leading to spurious high or low readings
Among relatively healthy populations at baseline, prospective studies in people over 60 have produced mixed results, with some finding associations between elevated B12 and mortality (Mendonca, 2018

However, if the research demands medical oversight for administration, injectables might be feasible
2007;28(Suppl
