B12 Shots at Home: How, Where & How Often to Inject Yourself AZ IV Medics How to Give an Insulin Injection What You Need to Know Treating Severe Vitamin B12 Deficiency B12 IM Injection Luer Lock Syringes 3 mL without Needle 5 16 inch, 0.3 mL Ultra Fine, 1 Mountainside Medical 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 How to Inject Insulin in 5 Easy Steps GoodRx