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2019 Jan;22(1):E45-E52
Blood tests, like B12 levels and complete blood counts, help check if the treatment is working
The most common side effect of B12 injections is irritation at the injection site, and injections are typically administered intramuscularly or subcutaneously. Less common side effects may include headache, nausea, diarrhea, itching, or a brief feeling of lightheadedness after the injection
It also plays a vital role in neurological function, mood regulation, and metabolism
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