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The National Institutes of Health Office of Dietary Supplements provided the following description in the Aug. 5, 2005 document "Dietary Supplement Fact Sheet: Vitamin D," available on the Office's website:
“About 98% to 99% of the milk supply in the U.S. is fortified with 10 micrograms (µg) (equal to 400 International Units or IU) of vitamin D per quart. One cup of vitamin D fortified milk supplies one-half [50%] of the recommended daily intake [Daily Value] for adults between the ages of 19 and 50, one-fourth [25%] of the recommended daily intake for adults between the ages of 51 and 70, and approximately 15% of the recommended daily intake for adults age 71 and over…
A food that provides 10-19% of the DV [Daily Value] is a good source and a food that provides 20% or more of the DV is high in that nutrient.”
Aug. 5, 2005