What Lil is telling you is true...the formulations of those "cleanses" are designed to give you some really creepy runs that make you believe you are ridding yourself of the evil parasites or cleansing your system. Until you study the gastrointestinal system closely, you won't realize that the gut already sheds it's lining every day; new cells are constantly being generated while older cells are sloughed off. That's why "cleansing" is such a misnomer; your body is perfectly equipped to cleanse itself without the aid of expensive solutions sold by snake oil salesmen!
I have many gripes about the medical profession as well, but at least they have peer-reviewed studies and some sort of regulations to follow. It is extremely difficult to prepare a pharmaceutical drug for approval from the FDA; endless trials, reviews, etc. Someone's magic parasite potion can be bottled sewer water, for all you know!
I remember that frame of mind that you have, i used to have it myself.
But that's what the ingredients list is for, if you think it's sewer water. And also think about
this, if someone was selling a product that had absolutely no value what so ever, don't you think enough people would take it and be dissatisfied and never buy their products again?
That's not the case from the various herbal suppliers and natural sellers.