What should I know about the interaction between Coumadin (Warfarin) and Vitamin K?

When taking Coumadin (Warfarin), your healthcare providers may recommend that you closely monitor the amount of Vitamin K that you consume. FNIC cannot provide individualized medical nutrition advice, but has general resources devoted to Vitamin K at Food Composition > Vitamins and Minerals > Vitamin K. In particular, you may want to look at Vitamin K: Interactions with Coumadin (PDF | 39 KB).

Also, find a report for foods containing Vitamin K from the USDA NDL at Food Compostion > USDA Nutrient Data Laboratory > Reports by Single Nutrients. The single nutrient reports are provided in two formats:

  1. Sorted alphabetically by Food Description (select A)
  2. Sorted (high to low) by Content Per Common Measure (select W)

These resources provide general information and do not take the place of consultation with your healthcare providers, including an RD. The Academy of Nutrition and Dietetics can help you locate an RD with Find a Registered Dietitian.

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