People on blood thinners should avoid or use caution w/ supplements containing the following herbs & foods not to cause bleeding – angelica root, asafetida, capsicum, turmeric, garlic, ginger, willow bark, celery, onion, parsley; vitamin K rich products like green leafy vegetables, green tea, kale, spinach, cauliflower, broccoli, cranberry, Brussels sprouts – as well as 'cleanses.' Source by memoryblank