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A common approach uses 4-8 weeks on followed by 2-4 weeks off
Severity, cause, and patient tolerance guide care
Hematologic disorders like chronic myelogeneous leukemia, promyelocytic leukemia, polycythemia vera, and hypereosinophilic syndrome can present as elevated serum blood levels of vitamin B12, which is also known clinically as serum cobalamin, note the authors of a 2013 research review published in the journal Clinical Biochemistry
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