How to Self Inject Vitamin B12 at Home The Sanctuary Wellness Institute Choosing the Right Needle and Syringe for B12 Injections: A Complete Guide Insulin syringes Understanding the Differences: Insulin Syringes vs. Regular Syringes Needle Sizes Explained: Choosing the Right Gauge for Different Injections 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