What Syringe Size to Use for B12 TikTok How to self inject intramuscular vitamin B12 Overview Guy's and St Thomas' NHS Foundation Trust 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 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 VanishPoint 29 Gauge x 5 16 inch Retractable Insulin Syringe with Needle 1 mL, Regular Wall, 100 Box