Cited by 526Folate and B Vitamins ResearchPorphyrin Metabolism and DisordersNutrition and Health Studies

Vitamin B12 in Health and Disease

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O’Leary, Fiona, Samman, Samir·2010·Nutrients

Abstract

Vitamin B(12) is essential for DNA synthesis and for cellular energy production.This review aims to outline the metabolism of vitamin B(12), and to evaluate the causes and consequences of sub-clinical vitamin B(12) deficiency. Vitamin B(12) deficiency is common, mainly due to limited dietary intake of animal foods or malabsorption of the vitamin. Vegetarians are at risk of vitamin B(12) deficiency as are other groups with low intakes of animal foods or those with restrictive dietary patterns. Malabsorption of vitamin B(12) is most commonly seen in the elderly, secondary to gastric achlorhydria. The symptoms of sub-clinical deficiency are subtle and often not recognized. The long-term consequences of sub-clinical deficiency are not fully known but may include adverse effects on pregnancy outcomes, vascular, cognitive, bone and eye health.

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  • Cobalamin deficiency induces neurological dysfunction, including myelopathy, neuropathy and neuropsychiatric abnormalities, and is associated with mental and cognitive impairment up to dementia.

    “Cobalamin (vitamin B12) deficiency induces neurological dysfunction, including myelopathy, neuropathy and neuropsychiatric abnormalities. Such neurological damage has been reported in 20–30% of cases of vitamin B12 deficiency [147], and can even occur before serum vitamin B12 concentrations reach a level that would be considered deficient by standard criteria.”

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  1. [3]Food and Nutrition Board Institute of Medicine, Vitamin B12 Dietary reference intakes for thiamin, riboflavin, niacin, vitamin B6, folate, vitamin B12, pantothenic acid, biotin and choline National Research Council National Academy Press Washington, DC, USA 1998 306 356 23193625
  2. [9]Carmel R. Sarrai M. Diagnosis and management of clinical and subclinical cobalamin deficiency: advances and controversies Curr. Hematol. Rep. 2006 5 23 33 16537043
  3. [11]Heyssel R.M. Bozian R.C. Darby W.J. Bell M.C. Vitamin B12 turnover in man. The assimilation of vitamin B12 from natural foodstuff by man and estimates of minimal daily requirements Am. J. Clin. Nutr. 1966 18 176 184 5948742
  4. [13]Chanarin I. The Megaloblastic Anaemias 2nd Blackwell Scientific Oxford, UK 1979

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Authors
O’Leary, F., & Samman, S.
Affiliations
The University of Sydney (AU)
Corresponding author
Samman, Samir
Venue
Nutrients
Publisher
MDPI AG
Published
2010-03-05
Volume
2
Issue
3
Pages
299-316
ISSN
2072-6643 (ISSN-L)
OpenAlex
W2165998744
Cited by
524
References
100
Citations by year
2026: 91 · 2025: 71 · 2024: 56 · 2023: 61 · 2022: 45 · 2021: 42 · 2020: 26 · 2019: 33 · 2018: 20 · 2017: 16 · 2016: 16 · 2015: 10 · 2014: 14 · 2013: 11 · 2012: 6
FWCI
0.85
Type
journal article
Language
en
Open access
Locations
  • Nutrients (publishedVersion, cc-by)
  • Europe PMC (PubMed Central) (publishedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion)
Topics
  • Health Sciences › Medicine › Rheumatology › Folate and B Vitamins Research
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Porphyrin Metabolism and Disorders
  • Health Sciences › Medicine › Public Health, Environmental and Occupational Health › Nutrition and Health Studies
Keywords
vitamin B12, vitamin B12 metabolism, dietary intake, malabsorption, achlorhydria, vegetarians, restrictive diets, pregnancy outcomes, cognitive health, bone health, eye health, vascular health
MeSH terms
Absorption, Cardiovascular Diseases, Cognition Disorders, Female, Food, Humans, Male, Neural Tube Defects, Nutritional Requirements, Osteoporosis, Pregnancy, Pregnancy Complications, Vitamin B 12, Vitamin B 12 Deficiency, Biomarkers

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