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 to self inject intramuscular vitamin B12 Overview Guy's and St Thomas' NHS Foundation Trust Syringes and Needles Medical Syringes Luer Lock Self injecting vitamin B12. Quick and painless jabs after a B12 by Dr Caroline Palmer Medium Needle Sizes Explained: Choosing the Right Gauge for Different Injections Choosing the Right Needle and Syringe for B12 Injections: A Complete Guide