How to Give a B12 Injection: Step By Step Instructions 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 Cyanocobalamin (B12) 1000mcg mL Injection 30mL MDV McGuff Dr. prescribed B12 injections. Pharmacy only gave me vials. Where do you get your needles and syringes? What size?? Where do I inject? : r B12_Deficiency
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what gauge for b12 injections Do You Need a Prescription for B12 Injections?