Best Vitamin B12 Injection Site: Administering B12 Shots 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 Syringe Sizes KMED
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what size needle is best for b12 injections A Guide to Needle and Syringe Choices