What kind of juice are you specifying? This is because different fruit juices have different effects in the human body. Only when you look at a particular kind of juice can you find out whether it will have any effects on specific body organs. As for juices that help detoxify the liver and the kidney, you can opt for carrot juice, parsley juice and asparagus juice, as these will help these organs perform to their best extent. Lemon water is a great saver too, and apple juice is also widely known to be good for the liver. Try juices made of dandelion leaf for keeping your liver up and running.