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What do I need to know about Vitamin K, if I am taking warfarin (Coumadin)? Changes in the amount of vitamin K in the diet can alter the metabolism of warfarin (Coumadin Â®). However, vitamin K does not influence the action of other blood thinners, such as heparin or low molecular weight heparins (Lovenox Â®. Fragmin Â®, or Innohep Â®).
Vitamin K - Eating an increased amount of foods rich in vitamin K can lower the PT and INR, making warfarin less effective and potentially increasing the risk of blood clots. Patients who take warfarin should aim to eat a relatively similar amount of vitamin K each week.