how long for vitamin b12 injection to take effect Fast Does a Shot Work? How Long Does a B12

Complete assessment requires at least 8 weeks of consistent protocol adherence

People with megaloblastic anemia, some gut problems, or malabsorption might need both

Hypokalemia and thrombocytosis could occur upon conversion of severe megaloblastic anemia to normal erythropoiesis with methylcobalamin therapy

We order vitamin B12 and folate testing when a person with Down syndrome we are evaluating has symptoms described above, has a lab abnormality for which follow up testing of vitamin B12 and/or folate is indicated, or the person has a condition in which deficiency is common (e.g., celiac disease)

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