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 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 Where to Inject Vitamin B12 At Home Vitamin B12 4 Week Injection Package MUST BE A FLORIDA RESID CardioMender, MD B12 Shots & B12 Injections: The Good, Bad and Alternative! How SubQ Injections Like B12 and NAD+ Fit Your Routine Olympia Pharmaceuticals