allergic reaction b12 injection If you are getting red,
If you are getting red, itchy welts from peptide injections, that is almost certainly not an allergic reaction. It is a pseudo allergic response called MRGPRX2 mediated mast cell degranulation, and the injection route Common & Rare Side Effects of Vitamin B12 Injections Adverse reactions to vitamin B12 injections due : Allergy How can anaphylaxis occur with a vitamin B12 injection?
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