B12 Shots Needle Size B12 Injections at Allura Skin, Laser & Wellness Clinic 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 Medsitis' Guide To Syringes & Needles.
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what size needle to use for b12 injection What Size Needle for B12 Injection?