I am on coumadin my self and I watch my vitamin k very closely and I keep a current list of foods with vt/k, teas are on this list. Black tea is on the low list, green tea is on the high list, meaning the amount of vt/k, and therefore greentea, if I'm not mistaken will make your inr/pt lower. You can get on the internet under any health net and get a vt/k list or you can get one from your family physicain. I you choose to use this, do it consistanly and you can manage your coumadin accorindly. This has always worked for me on the things I like to keep in my regular diet, consitant-consistant-consisant.
Hope this has help you.
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