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can b12 injections make you feel sick Are Shots Safe? Royal Palm Beach Medical Group Vitamin B12 Side Effects Stomach:
Description
Vitamin B12 injections have long been the only treatment for pernicious anemia

Subcutaneous Dosing Considerations Subcutaneous shots have a similar dose to intramuscular ones

[30] At the injection site, its possible to have some redness, swelling, or irritation

It all comes down to an enzyme called NNMT

2012 [cited 2022 Sep 10]
Maybe try to use a search?
