How to self inject intramuscular vitamin B12 Overview Guy's and St Thomas' NHS Foundation Trust How to Give a B12 Injection: Step By Step Instructions Do You Need a Prescription for B12 Injections? OmegaQuant How Quickly Do Vitamin B12 Injections Work? Prime Aesthetics 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 How to Give Yourself a B12 Injection ThinWorks