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 How to Self Inject Vitamin B12 at Home The Sanctuary Wellness Institute How to Give a B12 Injection: Step By Step Instructions B12 vitamin Store How to inject B12 in your arm
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