B 12 (Methylcobalamin) Therapy MedClub by Dr Jenn Not All Shots Are Created Equal Your Quick Guide to Injection Types , Ever wondered why some shots go in your arm muscle and others just under the skin? Heres the breakdown:, Intramuscular (IM) 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 Vitamin B12 Injections: Benefits and Risks