Potential Side Effects While Vitamin B12 injections are generally safe, some people may experience mild side effects, including: Pain or redness at the injection site Mild diarrhea Itching or rash Headache Dizziness Severe allergic reactions are rare but require immediate medical attention
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Faster infusion rates increase the chance of acute discomfort like flushing, nausea, chest tightness, or headache
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This avoids reliance on generic tables or guesswork, ensuring that every vial, whether 5mg, 10mg, or 20mg, is handled correctly