I stopped drinking coffee because I would overload it with cream and sugar which my metabolism really can not keep up with anymore. I discovered dandelion root and chicory tea which I really enjoy with a bit of stevia, however, I am on warfarin. Dandelion root is really high in vitamin K so my INR was going all over the place. Is there an herb or root that I can make a tea out of that will not interfere with warfarin?