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Vitamin B 12 Deficiency
(Cyanocobalamin Deficiency; Vitamin B12 Deficiency)


A nutritional condition produced by a deficiency of VITAMIN B 12 in the diet, characterized by megaloblastic anemia. Since vitamin B 12 is not present in plants, humans have obtained their supply from animal products, from multivitamin supplements in the form of pills, and as additives to food preparations. A wide variety of neuropsychiatric abnormalities is also seen in vitamin b 12 deficiency and appears to be due to an undefined defect involving myelin synthesis. (From Cecil Textbook of medicine, 19th ed, p848)

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B-12 deficiencies affect three
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Vitamin B12 Deficiency
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Vitamin B12 deficiencies often
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Vitamin B12 Deficiency Figure
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Vitamin B12 deficiency can
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Schilling rudderSchilling & GraebnerSpiezer SchillingMethylmalonic acidPavel SchillingSchilling of SolothurnA. Schilling & CompanySchillingsAustrian schillingDiebold Schilling the Younger

More information


  • Reported cases - Summary of cases reported on this disease.
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  • MEDLINE - Literature from the National Library of Medicine.
  • MeSH - Medical Subject Headings.
  • DeCS - Health Sciences Descriptors.

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Last update: April 2009
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