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B12 vitamin Store How to Perform a Subcutaneous Injection of Vitamin B12 Best Vitamin B12 Injection Site: Administering B12 Shots For subcutaneous injections, using shorter needles (4 5mm) is the safest choice to ensure medication stays in the fatty layer and avoids muscle injury. A 4mm needle is ideal, minimizing pain while keeping Best Vitamin B12 Injection Sites MedHealth 360
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