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Vitamin B12
What is the health risk of too much vitamin B12?
The Institute of Medicine of the National Academy of Sciences did not establish a Tolerable Upper Intake Level for this vitamin because Vitamin B12 has a very low potential for toxicity. The Institute of Medicine states that "no adverse effects have been associated with excess vitamin B12 intake from food and supplements in healthy individuals" [7]. In fact, the Institute recommends that adults over 50 years of age get most of their vitamin B12 from vitamin supplements or fortified food because of the high incidence of impaired absorption of B12 from animal foods in this age group [7].
Selecting a healthful diet
As the 2000 Dietary Guidelines for Americans states, "Different foods contain different nutrients and other healthful substances. No single food can supply all the nutrients in the amounts you need" [52]. For more information about building a healthful diet, refer to the Dietary Guidelines for Americans http://www.usda.gov/cnpp/DietGd.pdf and the US Department of Agriculture's Food Guide Pyramid http://www.nal.usda.gov/fnic/Fpyr/pyramid.html .
What foods provide vitamin B12?
