Vitamin B12 deficiency is associated with various symptoms, of which the haematological and neurological manifestations are the most prominent. This PrimeView focuses on the causes of vitamin B12 deficiency, including inadequate intake, malabsorption, or defects in transport or intracellular metabolism.
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Vitamin B12 deficiency. Nat Rev Dis Primers 3, 17041 (2017). https://doi.org/10.1038/nrdp.2017.41