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Moreover, low levels of B12 reduce the supply of oxygen, which leads to a decrease in the RBC count

Methylcobalamin serves as a cofactor for methionine synthase, an enzyme critical for DNA synthesis, neurotransmitter production, and homocysteine metabolism

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Supplementary material The supplementary material for this article can be found online at: References 1

Because fibromyalgia shares symptoms with other conditionsincluding rheumatoid arthritis, lupus, and thyroid disordersour specialists may order laboratory tests or imaging studies to rule out these alternatives