B12 Shots at Home: How, Where & How Often to Inject Yourself AZ IV Medics B12 vitamin Store How to inject B12 in your arm Injection Sites Quick Revision for Nursing Students Understanding the correct injection site is essential for safe medication administration. Intramuscular (IM) Injection Sites Deltoid Vastus Lateralis Ventrogluteal 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 B12 Injection: Step By Step Instructions