Places for Intramuscular Injection: 4 Safe Spots 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 B 12 (Methylcobalamin) Therapy MedClub by Dr Jenn B12 Shots at Home: How, Where & How Often to Inject Yourself AZ IV Medics Common IM Injection Sites Deltoid (Upper Arm) Location: About 23 finger widths below the acromion process (shoulder bone). Best for: Vaccines and small volume injections (1 mL). Notes: Easy to access but limited