B12 Shots at Home: How, Where & How Often to Inject Yourself AZ IV Medics How to Give a B12 Injection: Step By Step Instructions Vitamin B D B12 Injections Near Ne Wilmington Urgent Care Clinic Wilmington Urgent Care And Family Clinic 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 What Happens If You Inject B12 Into Fat? PA Relief