I swung back and forth for years and honestly I don't know what comes first the chicken or the egg...
But I can guess; I say the chemicals released by parasites cause IBS/UC.
The cure is a lot more complicated since there are more issues involved when IBS is part of the symptom chain. Regardless, no parasite herb will help with a dysfunctional ileum; the “Vicious Cycle” must be stopped first.
As for testing; great if they can find something but IMO the deck is stacked against us. Blood tests now first electrify the blood so where 20 years ago a technician would have diagnosed parasites they are all zapped and the computers won’t pick them up. As for stool samples I have yet to have a positive one, but meanwhile I could post pictures that would make everyone (except those testing) positive of parasites.