Vitamin B12 Injections How SubQ Injections Like B12 and NAD+ Fit Your Routine Olympia Pharmaceuticals Administration of vaccines The Australian Immunisation Handbook 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 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 Shots Side Effects And How To Treat Them