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and USDA
Over half of adults in the United States report taking dietary supplements (DS). The amounts of nutrients or other bioactive dietary ingredients in these products vary from labeled amounts in unpredictable ways, even between and within products from the same company Because the information on actual ingredient content is often not publicly available, it is difficult for consumers and researchers to know how much of the dietary ingredients are present in marketed DS.
Provide researchers and consumers with estimates of the amounts of select ingredients in commonly consumed DS categories that are based on analytical measurements and statistical modeling and assessment of ingredient bioavailability.
