I have a history of kidney stones; a 37 year 90 - 100 stones per year history. The only thing that limits that number are birch capsules. Prior to finding this product with Secrets of the Tribe, I had to order from outside the US and lose a significant portion of my purchase to testing by border patrol services. Now I don't have that worry and I'm looking forward to many years of much less stones. Thank you so much.