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 = 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 How Big Are the Needles for Semaglutide Injections? At Home Vitamin B12 4 Week Injection Package MUST BE A FLORIDA RESID CardioMender, MD