Vitamin B12 deficiency Nature Reviews Disease Primers Addisonian anemia: a lack of vitamin B12 in persons who do not produce stomach intrinsic factor (IF) that facilitates absorption Pernicious anemia (antibodies to intrinsic factor or parietal cells IF 5 Amino 1 methylquinolinium iodide Causes of B12 deficiency and how its related to MTHFR?
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