What Size Needle for B12 Injection? 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 Different Types Of Needles: Know About The Gauge, Length & Sizes How to self inject intramuscular vitamin B12 Overview Guy's and St Thomas' NHS Foundation Trust
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what size needle is best for b12 injections At-Home Vitamin B12 4-Week Injection Package