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 Needle and Syringe Combos Needle and Syringe Combos Self injecting vitamin B12. Quick and painless jabs after a B12 by Dr Caroline Palmer Medium
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what size needle is best for b12 injections Different Types Of Needles: Know About The Gauge, Length & Sizes