a EAR=Estimated Average Requirement.
b UL=Tolerable Upper Intake Level.
c NA = not applicable.
d UL for magnesium applies to supplements only, not diet plus supplement.
e UK = Unknown because the UL applies only to intakes from supplements (magnesium) or from supplemental and fortification sources (niacin, folate, and vitamin E).
f The EAR and RDA for folate are expressed as μg dietary folate equivalents (DFE). However, insufficient information was available to convert intake data from the Continuing Survey of Food Intakes by Individuals to DFEs, thus for this example, folate intake is expressed in lag. Intake data were collected prior to folate fortification of grain products and thus underestimate current folate intake.
g The EAR is expressed in mg of α-tocopherol.
h Dietary intake data for selenium and vitamin E is from the Third National Health and Nutrition Examination Survey, 1988–1994.
i Accurate measures of vitamin E intake are difficult to obtain due to underreporting of fat intake; it is likely that the percent less than the EAR is an overestimate (IOM, 2000).
j Applies to any form of supplemental α-tocopherol.
SOURCE: 1994–1996 Continuing Survey of Food Intakes by Individuals.