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Other physical reactions Headaches Dizziness for a few hours Feeling jittery or nervous briefly Mild fever These effects usually disappear within 12 days
A: The effects can last 24 weeks, depending on your baseline B12 levels and lifestyle factors
10.7759/cureus.52011 28 JohanssonM.FranssonD.RundlfT.HuynhN.-H.ArvidssonT
They are not medicines, are not for human or animal consumption, and are supplied with no dosing or medical guidance
Annu Rev Biochem
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