How to Give a B12 Injection: Step By Step Instructions How To Self Inject B12 Instruction Guide for Intramuscular (IM) Self injection of B12 Methylcobalamin 1mg 5mg 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 Give a Subcutaneous Injection Video & Image