Best B12 Shots in Chicago & Naperville 2026 Instruction Guide for Intramuscular (IM) Self injection of B12 Methylcobalamin 1mg 5mg Choosing the Right Needle and Syringe for B12 Injections: A Complete Guide Subcutaneous Injection: What It Is and How to Give One 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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