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B12 Shots at Home: How, Where & How Often to Inject Yourself AZ IV Medics 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 A Guide to the Best Needles for B12 Injections Precision Labs Vitamin B12 Injection Sites: All You Need to Know
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