where to give vit b12 injections Vitamin Best Vitamin B12 Injection Sites
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Do not shake or wave the syringe to clear it, that introduces air

Frystyk J, Skjaerbaek C, Vestbo E, Fisker S, Orskov H

2009;120(7):13461351 [DOI] [PubMed] [Google Scholar] 55

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People who dont produce enough intrinsic factor can become deficient

For D51.0, this requires explicit confirmation of intrinsic factor deficiency rather than generic pernicious anemia terminology
