B12 Injection sites + How to use B12 Shots Safely Medsitis' Guide To Syringes & Needles. 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 Needle and Syringe Combos Self injecting vitamin B12. Quick and painless jabs after a B12 by Dr Caroline Palmer Medium
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needle size for im b12 injection A Guide to Needle and Syringe Choices