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Question:
Is it true that green tea can interact with blood-thinning medications like warfarin (Coumadin) or clopidogrel (Plavix)?

Answer:
While green tea contains vitamin K and catechins — both of which have the potential to counteract the effects of some blood thinning medications -- drinking a moderate amount of regular brewed green tea would not be expected to cause a problem. (However, matcha green tea could potentially intefere with certain blood-thinning medications.) For more details about this and other potential drug and nutrient interactions of green tea, see the "Concerns and Cautions" section of the Green Tea Review >>

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This CL Answer initially posted on 7/12/2016. Last updated 8/1/2017.

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