How to self inject intramuscular vitamin B12 Overview Guy's and St Thomas' NHS Foundation Trust What Size Needle for B12 Injection? Purchase Needles (PrecisionGlide) 1 inch or 1 2 inch at BiosenseClinic BiosenseClinic CA 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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