October 4, 2022
View change
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This fact sheet was comprehensively reviewed and extensively revised.
December 8, 2021
Updated the section on the common cold.
March 22, 2021
Linked to the new edition of the Dietary Guidelines for Americans and updated the associated text.
December 10, 2019
Changed text to clarify that the upper limits are "daily" amounts.
July 12, 2019
Updated the link to USDA’s FoodData Central.
