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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

Injections are very effective at raising blood levels of vitamin B12 and preventing or reversing a B12 deficiency

Most clients benefit from one to two injections per week during the active phase of their program, typically the first six to twelve weeks