i know what you are getting at. vit K hinders blood thinners like warfarin but not anti platelets drugs like clopidogrel which acts by limiting the platelets from sticking together. Warfarin works differently. I think i read something about preventing the fibrin forming the fibres that start the clot and vit K promotes this effect thus countering the warfarin. Green tea apparently is an anti platelet and so acts in the same way as the clopidogrel and so may over-do it.