Vitamin B-12: plant sources, requirements, and assay

Am J Clin Nutr. 1988 Sep;48(3 Suppl):852-8. doi: 10.1093/ajcn/48.3.852.


Vitamin B-12 is of singular interest in any discussion of vegetarian diets because this vitamin is not found in plant foods as are other vitamins. Many of the papers in the literature give values of vitamin B-12 in food that are false because as much as 80% of the activity by this method is due to inactive analogues of vitamin B-12.

Publication types

  • Review

MeSH terms

  • Diet, Vegetarian
  • Humans
  • Nutritional Requirements
  • Plants, Edible*
  • Vitamin B 12 / administration & dosage*
  • Vitamin B 12 / analysis
  • Vitamin B 12 / metabolism


  • Vitamin B 12