How to Give a B12 Injection: Step By Step Instructions CYANOCOBALAMIN INJECTION, USP 30000 mcg 30 mL (1000 mcg mL) 30 mL VIAL How to self inject intramuscular vitamin B12 Overview Guy's and St Thomas' NHS Foundation Trust What Conditions Do B12 Injections Help Treat in Shoreline, WA? Understanding the 4 main types of injections makes medical knowledge simple and clear. Intramuscular, Subcutaneous, Intradermal & Intravenous each one plays a different role in treatment. Stay informed, stay safe! Vitamin B12 Injection IV or IM