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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
The side effect profile is not trivial
Diabetologia 52 , 271280 (2009)
Research background
Many patients report a crisp surge in mental alertness, clarity, and physical stamina within 12 to 24 hours post-injection
The significance lies not in the B12 elevation per se, but in what it may reveal about your overall health status
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