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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
How does a Biotin injection help my hair and nails
Vitamin B12 is key for making red blood cells, nerve function, and DNA
The side effect profile is not trivial
Indeed, after a decade or so, those who had been taking high-dose B6 supplements had about a 40 percent higher hip fracture risk, but not those taking B12
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