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PMC 7776311

Its inclusion allows repeated access to a sealed multi-dose vial within a defined window, distinguishing this product from preservative-free sterile water, which is strictly single-use

The solution should be clear and colorless, although a slight yellow tint may be normal

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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