At Home Vitamin B12 4 Week Injection Package MUST BE A FLORIDA RESID CardioMender, MD Syringe Sizes? : r tirzepatidecompound Insulin Syringes 31 gauge x 5 16", 0.5 mL by SureComfort If youre still guessing needle sizes were not doing that in 2026 , Heres what you MUST know:, Smaller gauge number = BIGGER needle, 1820G = blood & trauma, 2123G = IM, 2527G = Vitamin B12 Injections in Oakland, CA FACE 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