Vitamin B12 Sources and Bioavailability

@article{Watanabe2007VitaminBS,
  title={Vitamin B12 Sources and Bioavailability},
  author={Fumio Watanabe},
  journal={Experimental Biology and Medicine},
  year={2007},
  volume={232},
  pages={1266 - 1274}
}
  • F. Watanabe
  • Published 1 November 2007
  • Biology, Medicine
  • Experimental Biology and Medicine
The usual dietary sources of vitamin B12 are animal foods, meat, milk, egg, fish, and shellfish. As the intrinsic factor-mediated intestinal absorption system is estimated to be saturated at about 1.5–2.0 μg per meal under physiologic conditions, vitamin B12 bioavailability significantly decreases with increasing intake of vitamin B12 per meal. The bioavailability of vitamin B12 in healthy humans from fish meat, sheep meat, and chicken meat averaged 42%, 56%–89%, and 61%–66%, respectively… Expand
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The contribution of ruminant food sources to B12 intake is specifically evaluated, with its bioavailability taken into account. Expand
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To prevent vitamin B 12 deficiency in high-risk populations such as vegetarians and elderly subjects, it is necessary to identify plant-source foods that contain high levels of bioactive vitamin B12 and, in conjunction, to prepare the use of crystallineitamin B12-fortified foods. Expand
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Nutritional availability of vitamin B12 is expected to be high in cow milk but potentially constrained in buffalo milk (with HC-vitamin B12). Expand
Vitamin B12-Containing Plant Food Sources for Vegetarians
TLDR
Dried purple laver (nori) is the most suitable Vitamin B12 source presently available for vegetarians and it contains high levels of other nutrients that are lacking in vegetarian diets, such as iron and n-3 polyunsaturated fatty acids. Expand
Vitamin B12 sources and microbial interaction
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Intakes of Vitamin B-12 from Dairy Food, Meat, and Fish and Shellfish Are Independently and Positively Associated with Vitamin B-12 Biomarker Status in Pregnant Dutch Women.
TLDR
In pregnant Dutch women, higher intakes of vitamin B-12 from dairy, meat, and fish were positively associated with vitamin B/12 status, suggesting that dairy, Meat, and Fish are good sources of bioactive vitamin B -12 in pregnancy. Expand
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TLDR
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TLDR
It seems unjustified to advocate algae and other plant foods as a safe source of vitamin B-12 because its bioavailability is questionable and further studies on the specificity of current vitamin B -12 assays are warranted. Expand
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TLDR
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TLDR
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