Guide to Needle Size and Dead Space Leaflet How to self inject intramuscular vitamin B12 Overview Guy's and St Thomas' NHS Foundation Trust 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 12 Week Injection Cycle Pack 24x 21G Green & 25G Orange Needles + Swabs
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what needle size for b12 injection B12 vitamin Store Needle and Syringe Information for injecting vitamin B12 and vitamin C. Find out what needle sizes are recommended