Ivy Grove Surgery : Self administration of B12 injection Needle gauge and length selection depends on medication type, injection route, tissue depth, and clinical purpose. Disclaimer For educational purposes only. Not medical advice. Consult a qualified healthcare professional. #NeedleGauge #Injection Here's what affects it: Needle gauge (we use 30 32 gauge, among the thinnest available). Injection depth (superficial vs. muscle). Area sensitivity (lips and nose more sensitive than forehead). Most patients rate discomfort B12 injections UK How I give myself a vitamin injection
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