Does size matter? Historically, a bigger needle gauge was considered better to prevent damage to red blood cells. However, our recent guidelines recommend using smaller gauge needles (2325 G) for all B12 Shots Needle Size Self injecting vitamin B12. Quick and painless jabs after a B12 by Dr Caroline Palmer Medium A Guide to Needle and Syringe Choices
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what size needle should i use for b12 injection How To Do An IM (Intramuscular) Injection