How to Self Inject Vitamin B12 at Home The Sanctuary Wellness Institute How to self inject intramuscular vitamin B12 Overview Guy's and St Thomas' NHS Foundation Trust How to Give a Subcutaneous Shot: Care Instructions What Happens If You Inject B12 Into Fat? PA Relief 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 Figure. Subcutaneous injection into the deltoid area The Australian Immunisation Handbook