Can green tea capsules increase chance of bleeding and bruising for any type of surgery?
You have asked a very good question. The process leading to blood clotting is complex with multiple steps involved. One concern comes from the high vitamin K content of green tea leaves, which in excess amounts could potentially interfere with the clotting mechanism, causing bleeding or bruising. This is not usually a concern when people drink a moderate amount of green tea because vitamin K is a fat soluble vitamin and is not extracted into the tea in an appreciable amount by the brewing process with water. However, as with everything, the dose is the poison. There is one case report of a gentleman consuming 1/2 to 1 gallon of green tea each day with lab tests indicating that it took his blood a longer time to clot than desired (Ann Pharmacother. 1999 Apr;33(4):426-8. Probable antagonism of warfarin by green tea. Taylor JR, Wilt VM). If one were actually ingesting the green tea leaves, in addition to the tea, then the potential for prolonged clotting time leading to bruising or bleedi
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