B12 Shots at Home: How, Where & How Often to Inject Yourself AZ IV Medics How to Give Yourself Intramuscular (IM) Injections Patients & Families UW Health Ivy Grove Surgery : Self administration of B12 injection 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