Holy moly, this stuff is awesome! I purchased this for my super senior gelding I bought 2 years ago to aid his hoof growth after pulling his shoes off. He transitioned to barefoot beautifully with little cracking. After so long on this product, his white feet are hardened and he walks off like he must have in his prime. It is so lovely seeing him comfortable again. I then put my new off-the-track Standardbred mare of this as soon as she got home in October. The last few visits the farrier has said that her feet are textbook perfect and that they could train the eye on what good hooves should look like. But goodness! I had heard that copper-zinc can neutralize iron and help with sun bleaching. And that is where this product has blown my mind. My horses live outside 24/7 and they are SPARK...