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Sore arm, strong immunity! If your arm is feeling a bit tender after getting your seasonal vaccines, you're not alone. This pain is a good sign that your immune system is making antibodies in response Benefits of Vitamin B12 Shots Complete Health Partners B12 Shots at Home: How, Where & How Often to Inject Yourself AZ IV Medics arm pain after b12 injection Why does my arm hurt after a shot?
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