Best Vitamin B12 Injection Sites: Where to Inject B12 PA Relief 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 B12 Injection sites + How to use B12 Shots Safely Giving yourself an injection Roswell Park Comprehensive Cancer Center Buffalo, NY
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