B12 Injections Vitamin B12 Therapy Hanover, MA ALDA Aesthetics Best Vitamin B12 Injection Sites: Where to Inject B12 PA Relief B12 Shots in Muncie, Indiana Evolve Medical Aesthetics + Wellness B12 Shots at Home: How, Where & How Often to Inject Yourself AZ IV Medics Vitamin B12 Injections Boost Energy & Wellness in Frankfort 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