The B12 Shot: What Every Human Needs to Know About Injectable Vitamin B12 How to Give a B12 Injection: Step By Step Instructions Types of Injections, Same Needle Different Depths IV, IM, SC, and ID look similar but act very differently inside the body. This visual shows where each injection goes, how deep it travels, B12 vitamin Store Intramuscular vs Subcutaneous Injections for vitamin B12 supplements. 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 Syringes and Needles Medical Syringes Luer Lock