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Mol Nutr Food Res
Injections are quick, usually taking only a few minutes, with minimal discomfort
In 2019, an internal medicine specialist could not find an objective cause for his B12 deficiency, and supplementation was stopped
While these are population-level numbers, the principle applies to individuals as well: routine injection visits for non-deficient patients add up in copays, travel time, and appointment scheduling without delivering additional benefit
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