Who needs to watch vitamin K?
Vitamin K can change how the blood thinner warfarin (Coumadin) works. People who take it may need to limit foods with vitamin K, and should eat about the same amount of them each day, says MedlinePlus. Sudden changes in vitamin K intake can change the effect of the medicine.
Ask your doctor or pharmacist before you change your diet while taking warfarin.
What the amounts include
The amounts in this ranking are vitamin K1 (phylloquinone), the form in plants. The FDA Daily Value for vitamin K is 120 µg a day.
Sources
- MedlinePlus, U.S. National Library of Medicine. Vitamin K. Reviewed 21 Jan 2025. Accessed 11 Nov 2026. https://medlineplus.gov/ency/article/002407.htm
- MedlinePlus, U.S. National Library of Medicine. Warfarin: Drug Information. Revised 15 Mar 2026. Accessed 11 Nov 2026. https://medlineplus.gov/druginfo/meds/a682277.html
- U.S. Food and Drug Administration. Daily Value on the Nutrition and Supplement Facts Labels. Current as of 5 Mar 2024. Accessed 11 Nov 2026. https://www.fda.gov/food/nutrition-facts-label/daily-value-nutrition-and-supplement-facts-labels






























