I also think that you will never get rid of all parasites. However if you are suffering, I am confident that you will get rid of THAT problem with the cleanses.
Each day though we get infected by anything. Air, eating, drinking. Anything it seems. Your body takes care of everything, but the things that it can't, we're just helping it out. I'm confident that as soon as we get better, we wont have to worry about that particular problem as long as we keep taking this.
While it seems really unhealthy, I know that once I'm done, I can have a cheeseburger and take the parasite killers and I'll be okay. Hahahahaha.