Vitamin B12 Injections (Cyanocobalamin Injections) Mountainside Medical B12 vitamin Store Intramuscular vs Subcutaneous Injections for vitamin B12 supplements. Giving Your Cat a Vitamin B12 Boost. The Art of Doing Stuff Dr. prescribed B12 injections. Pharmacy only gave me vials. Where do you get your needles and syringes? What size?? Where do I inject? : r B12_Deficiency Choosing the Right Needle and Syringe for B12 Injections: A Complete Guide 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