Have you checked the back posts of some of us who have been on here for a while? I have posted back along, several months ago, while earlier in this program, I had 3 of the big, beef tapeworms that I got rid of by doing 3 rounds of the Zymex ll. You gotta take it in between meals so it digests the tapeworms instead of your food. I also got rid of loads of the miniature tapeworms with this product and I am sure it digested lots of other intestinal worms I had. You can do the "either or" when it comes to the Zymex ll or the Clark mop-up program, but I found the Zymex ll to be lots more efficient and much easier to do. The NHP here uses the Zymex ll. I am not sure what the advantage of doing the Clark mop-up program is. I've had no more problems with tapeworms after doing the Zymex ll.