B12 vitamin Store How to Perform a Subcutaneous Injection of Vitamin B12 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 B12 Injection sites + How to use B12 Shots Safely How to self inject intramuscular vitamin B12 Overview Guy's and St Thomas' NHS Foundation Trust