[An arbitrary unit for measurement the efficiency with which ingested provitamin A carotenoids (such as carotenes, xanthophylls, and compounds that arise from rearrangement of carotene I skeleton) are absorbed and converted to the active form of vitamin A in a mixed diet. The concept of retinol equivalent (RE) introduced by FAO/WHO Expert Group in 1967, is established on the following relationships among food sources of vitamin A based on carotenoids bioavailability and bioconversion data: one microgram of retinol is equal to one RE, one microgram of beta-carotene is equal to 0.167 RE, and one microgram of other pro-vitamin A carotenoids is equal to 0.084 RE. ( NCI )]
UMLS (NCI) C0556581 
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