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Vitamin B12 injections are generally safe, but some individuals may experience side effects, including: Pain or redness at the injection site Mild diarrhea Itching Nausea or vomiting Dizziness or headaches Hot flashes In rare cases, more serious reactions, such as allergic responses (rash, swelling, trouble breathing), can occur
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Some symptoms, including fatigue and memory loss, can indicate other conditions such as a thyroid disorder
Increased attachment was observed to the inactive forms TC I and III, two transport proteins that only ensure the binding of free vitamin B12
