I just learned about this recently as a cure for worms, especially tapeworms. It's fascinating therapy because you're attacking the worms with what they hate - a dirt that to them is like razor blades, it literally cuts them up but does no damage to our own intestines or skin.
It's a much cheaper and more thorough therapy than Coenzyme Q10 and it's been in use for centuries for both people and animals. I was totally sold on the idea when I heard that horse people use it, because horse people are very very careful to do what's best for their horses! :)
I'm going to use it on my dog, he's been showing bits of a Tapeworm
stuck to his tail. I'm not sure where I'm going to buy it from yet, so if anyone knows a good source let me know!