What Size Needle for B12 Injection? B12 Injection sites + How to use B12 Shots Safely B12 vitamin Store Intramuscular vs Subcutaneous Injections for vitamin B12 supplements. 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
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what gauge for b12 injections Injection Technique & Needle Gauges