December 15, 2023
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Clarified the types of foods that contain vitamin B12 and added oysters as a source of vitamin B12.
July 7, 2021
This fact sheet was comprehensively reviewed and extensively revised.
January 13, 2021
Linked to the new edition of the Dietary Guidelines for Americans and updated the associated text.
March 30, 2020
Revised text in the "What kinds of vitamin B12 dietary supplements are available?" section to state that vitamin B12 is also available as a prescription medication in a nasal gel form that is sprayed into the nose.
July 11, 2019
Updated the link to USDA’s FoodData Central.
