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 Vitamin B12 Injections Preferred Healthcare Syringes and Needles Medical Syringes Luer Lock How to Give a B12 Injection: Step By Step Instructions
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needle size for im b12 injection What Size Needle for B12 Injection?