Please look at the directions for ParaCan. If it says that you can eliminate parasites with a two week (or less) course of treatment, it is a waste of your time and money. parasites take months to kill because of their life cycles. You have to kill the adults and then make sure that you kill all of the eggs. And you have to be sure that you have killed off any strays. Taking an herbal formula is only a part of a total protocol to kill parasites.
Google Dr. Andreas Kalcker and read his parasite protocol. He says that you have to do 12 months to be sure that you have gotten everything.