How To Give Yourself Vitamin B12 Shots (with video!) B12 Shots: Vitamin B12 Injections Benefits, Uses, Risks Dr. Axe 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 you Needle Sizes Explained: Choosing the Right Gauge for Different Injections U100 Insulin Syringes Guide: Sizes, Units & Safety Tips 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