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Harvard Heart Letter

Ask the doctor: Do people on warfarin need to avoid vitamin supplements that contain vitamin K?

You mentioned Centrum Cardio, a new multivitamin supplement that supposedly lowers cholesterol. Taking two tablets a day would deliver 25 micrograms of vitamin K. Is it wise to recommend this product for someone taking warfarin or other anticoagulants?

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Ask the doctor: Do people on warfarin need to avoid vitamin supplements that contain vitamin K?

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