Subcutaneous Injection: What It Is and How to Give One Cyanocobalamin Vitamin B12 Injection 1000 mcg Mountainside Medical B12 vitamin Store Intramuscular vs Subcutaneous Injections for vitamin B12 supplements. 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 Subcutaneous (SC) and Intramuscular (IM) Injections Must Knows for Subcutaneous administration: Pinch skin with non dominant hand and hold syringe with dominant hand Always inject: 2 inches away from umbilicus (for abdomen) 3 inches