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B12 Shots at Home: How, Where & How Often to Inject Yourself AZ IV Medics Not all shots are the same here's a guide Injections are a fast, effective way to deliver medications, nutrients, and vaccines directly into the body but not all injections are the same. 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 B12 injections UK How I give myself a vitamin injection Places for Intramuscular Injection: 4 Safe Spots
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