Methylcobalamin 10,000mcg injectable, 10mL (lyophilized) Defy Medical Insulin injections: Selecting the injection site B12 vitamin Store Intramuscular vs Subcutaneous Injections for vitamin B12 supplements. Where to Inject Vitamin B12
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arm b12 injection sites Common IM Injection Sites Deltoid (Upper Arm) Location: About 2–3 finger widths below the acromion process (shoulder bone). Best for: Vaccines and small-volume injections (≤1 mL). Notes: Easy to access but limited