Insulin Syringes 31 g x 8 mm 1 mL Ultra Fine 100 Box 328418 B12 Injection sites + How to use B12 Shots Safely 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 Insulin B12 Injections for Weight Loss Does it Even Work? Infusion For Health B12 Shots at Home: How, Where & How Often to Inject Yourself AZ IV Medics