Kairah, Bentonite on it's own is to remove toxins as you probably already know. This will create a better environment that parasited with find it difficult to thrive in. I'm not sure what program you're doing but using psyllium with Bentonite in your programs with remove some parasites. But they are not suppose to be a cure all. The zapper I know nothing of and sound questionable. I did spend the twenty five dollars and by an anti-parasitic from the health food store. But there are numerous products easier to take and less expensive. Aerobic 7 is one, costs $10. Grapefruit seed extract tastes terrible but it another alternative.
During my Larry Clapp (prostate90.com)lemonade fast worm like things started coming out. I freaked and wanted to make sure I was clean. I found Jansen made a product called Vermox, only by prescription. Well, I am tired of doctors and the system, so I ordered the product from Mexicodrugstore.com. No prescription needed.
This is another option. Good Luck!