There are documented cases of cranberry supplements interacting with warfarin. This can lead to bleeding.
Lab studies of platelets show Feverfew can affect their ability to stick together and form clots.
Animal studies show Evening Primrose Oil slows the clotting process and stops platelets from sticking together. So it may make you bleed more during and after surgery, and when taken with warfarin or NSAIDs. More research in humans is needed.
*Courtesy of WebMD
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