How to Give a B12 Injection: Step By Step Instructions Intramuscular Vitamin Injection Course: B12, Biotin, C & D Activated B12 Booster Wellness IV Infusion Therapy 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
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