Instruction Guide for Intramuscular (IM) Self injection of B12 Methylcobalamin 1mg 5mg Safe B12 Injection Guide at Home Step by Step Tutorial YouTube 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 vitamin Store How to inject B12 in your arm How to self inject intramuscular vitamin B12 Overview Guy's and St Thomas' NHS Foundation Trust
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