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For dietary deficiency and mild absorption issues, high-dose oral therapy can restore levels without the injection-related local reactions or the tiny chance of anaphylaxis
An explanation of how we came to these new recommendations can be found in Vitamin B12: Rationale for Recommendations
In severe cases of vitamin B12 deficiency, like pernicious anemia, regular injections may be required to maintain adequate levels
Injections are probably useless if you dont have a deficiency
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