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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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One of the eight <b>B vitamins</b>,
One of the eight B vitamins,
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<b>Vitamin B 12</b> also plays an
Vitamin B 12 also plays an
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Vitamin B12 Deficiency
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Vitamin B12 deficiencies often
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<b>Vitamin B</b>-<b>12 deficiency</b>
Vitamin B-12 deficiency
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Vitamin B12 absorption and
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<b>Vitamin B12</b> source
Vitamin B12 source
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Vitamin B-12 Deficiency and
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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.
  • Related terms - Look for sites, images, videos, news and articles about related terms.
  • SearchMedica - Professional Medical Search.
  • WHO - World Health Organization.
  • PubMed - A service of the National Library of Medicine and National Institutes of Health.
  • 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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