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 Instruction Guide for Intramuscular (IM) Self injection of B12 Methylcobalamin 1mg 5mg Best Vitamin B12 Injection Sites: Where to Inject B12 PA Relief
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