How To Self Administer Vitamin B12 Injections Invigor Medical 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 What size gauge needle is needed for vitamin B12 (cobalamin) injections? Intravenous Needle Gauges Needle Size for B12 Injection: 5 Must Know Tips
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