How to Give a B12 Injection: Step By Step Instructions 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 Injection Needle Size B12 Syringes Is b12 im or sq How to self inject intramuscular vitamin B12 Overview Guy's and St Thomas' NHS Foundation Trust
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