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[DOI] [PubMed] [Google Scholar] 99.Inoue K, Valdez GR, Reyes TM, et al

The frequency of B12 injections varies based on individual needs: For deficiency correction: Injections may be administered more frequently, such as weekly or monthly, until levels normalize. For maintenance: Once adequate levels are achieved, monthly injections are typically recommended

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The exact mechanisms are complex, but broadly NAD+ injections may counteract NAD+ depletion and support better cellular function, especially in high-demand tissues like the brain and muscles

Canadian Medical Association Journal 2013;185(4):E20111