What is the best injection site for intramuscular (IM) B12 injections? 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 Standard Guideline Template B12 vitamin Store How to Give an Intramuscular Injection of Vitamin B12
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