"Detoxing" kidneys is not necessarily the way to go all the time. A tonic might be in order. I have found "du zhong" (chinese) to be fine. Look it up on the internet and read up, and see if what they say applies to you. It is mild & safe. It is best cooked up in the traditional way (a slow cooker is good), but it doesn't taste so hot because, after all, it is a type of bark of the rubber tree!