Cyanocobalamin Injection: Vitamin B12 Deficiency Relief Mountainside Medical Is intramuscular (IM) administration of vitamin B12 injections preferred over subcutaneous (SC) administration? Not all shots are the same here's a guide Injections are a fast, effective way to deliver medications, nutrients, and vaccines directly into the bodybut not all injections are the Is It Okay To Use A B12 Injection With Insulin Syringes?