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How Much Vitamin B12 Should I Take Per Day? B12 Dosage Everlywell Vitamin B12 PMC Vitamin B12 Deficiency: Vitamin B12 deficiency is a nutritional or absorption related disorder leading to impaired DNA synthesis and neurologic dysfunction, commonly presenting with megaloblastic anemia and neuropsychiatric symptoms. Physiological Mayo Clinic: Vitamin B 12 Well Nurse Clinic
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