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b12 injection with insulin needles Choosing the Right Needle and Syringe for Injections: A Complete Guide B12 IM Needles & Syringe:
Description
Igarashi, M

A thinner needle (higher gauge) causes less discomfort but draws medication more slowly, which is why many patients use a wider drawing needle and switch to a thinner needle before injecting

Mild reactions can include temporary injection site redness and occasional headaches

Other treatment options include recombinant erythropoietin injections