November 1, 2022
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Updated the “What kinds of folate dietary supplements are available?” section to state that people who could become pregnant should get 400 mcg a day of folic acid, not 5-MTHF, even if they have an MTHFR C677T gene variant.
March 22, 2021
Linked to the new edition of the Dietary Guidelines for Americans and updated the associated text.
July 11, 2019
Updated the link to USDA’s FoodData Central.
December 7, 2018
This fact sheet was comprehensively reviewed and extensively revised.
