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Retinol Activity Equivalent
Definition 1
An arbitrary unit for measurement of the bioefficacy of ingested provitamin A carotenoids introduced by the U.S. Institute of Medicine (IOM). For a given amount of provitamin A compounds in a mixed diet, IOM estimates that the number of retinol activity e (RAE) is half the number of RE suggested by FAO/WHO. RAE is viewed as an approximate guideline because it was defined on the basis of relatively few studies and limited data on carotenoids bioavailability and bioconversion. (NCI Thesaurus)
Definition 2
Unit of measure using an accepted conversion formula which adjusts for the lower bioavailability of provitamin A carotenoids in food compared to retinol. (NCI Thesaurus/CRCH)
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