How Big Are the Needles for Semaglutide Injections? 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 BD 309582 Syringe with Needle 3cc Luer Lock Disposable 25G x 1" Sterile, Single Use Syringe for Precision Intramuscular Injections, 100 BX, 8 BX CS CIA Medical Do You Need a Prescription for B12 Injections? OmegaQuant VanishPoint 29 Gauge x 5 16 inch Retractable Insulin Syringe with Needle 1 mL, Regular Wall, 100 Box