is b12 tablets as good as injections vs Pills: Richmond's Complete Guide B12 Injections vs Oral Supplements:

Abstract Background The purpose of this study was to compare clinical features of vitamin B 12 deficiency patients with a history of gastrectomy to those without a history of gastrectomy

They just may not be enough on their own once NAD+ depletion has already begun

People Taking Certain Medications Some commonly prescribed medications can deplete B12 over time

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