Wheatgrass and Warfarin

Publication Date:
Tue, 11/08/2011        
By: Alere Staff

Wheatgrass and Warfarin

Wheatgrass is a nutrient-rich type of young grass in the wheat family. It grows in temperate regions throughout Europe and the United States and can grow indoors or outdoors. You can drink the juice by itself or added to smoothies or teas. It is sold as a dietary supplement in capsule, tablet or liquid form. Some people believe that wheatgrass has numerous health benefits, but there are no significant research studies to support these claims.

When you decide to start a new dietary supplement, it is best to check with your doctor. The vitamin K in fresh wheatgrass juice could interact with warfarin.1 According to NutritionData.com, 4 grams of wheatgrass contains 35 micrograms of vitamin K.Taking wheatgrass while taking warfarin could be dangerous as it may affect your INR levels.

The most important thing to remember is to remain consistent with your diet. Consistency in diet means to be aware of the type of foods you choose every day, pay attention to your portion sizes and be aware of the frequency you consume foods high in vitamin K. For more information about the amount of vitamin K in the foods and beverages you consume, check out our Vitamin K Finder.

Very few studies have been done to review the potential for interaction between botanicals and other natural products with warfarin. It is important to talk with your doctor about starting any new foods because they can interact with your warfarin, so please keep this in mind when planning your next meal.

  1. Padalia, S., et al. Multitude potential of wheatgrass juice (Green Blood): An overview. Chronicles of Young Scientists. 2010. Vol 2, Issue 2. Pg 23-28.
  2. Self Nutrition Data. Wheat Grass. http://nutritiondata.self.com/facts/custom/900675/2. Accessed May 30, 2014.