B12 Injections for Energy: Benefits and How It Works AZ IV Medics How to self inject intramuscular vitamin B12 Overview Guy's and St Thomas' NHS Foundation Trust Cyanocobalamin Vitamin B12 Injection 1000 mcg Mountainside Medical Subcutaneous Injection Sites and Instructions for Safe Self Administration 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 How to self inject intramuscular vitamin B12 Overview Guy's and St Thomas' NHS Foundation Trust