Do B12 Injections Hurt? Painful Shots No More PA Relief 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 Needle Sizes Explained: Choosing the Right Gauge for Different Injections Choosing the Right Needle and Syringe for B12 Injections: A Complete Guide U100 Insulin Syringes Guide: Sizes, Units & Safety Tips How to self administer subcutaneous B12 injection. 1. Withdraw proper dosage from vial into an insulin syringe 2. Clean site of injection (abdomen or other proper site) 3. Pinch the skin where