I really believe Chanca Piedra is a miracle herb. I was having very bad kidney pains when I started taking Calcium and Vitamin D supplements. All the pain vanished when I started taking Chanca Piedra in a drop form. I was taking 60 drops in the morning with a half glass of warm water and one in the afternoon. So I know it helped me somehow. I was going to buy it again but this time I am waiting to do a Liver Flush and use it once I am done with liver flush. But it really helps with stones in the body.