My best results have been from l-cystene and the blackwalnut hull/wormwood/clove tincture (pill form also).

I have and use both for about two months now. I like both of them, but I like smell of Clarkia better- does that have anything to do as potency indicator? I got quite a few parasites only during my first LF, but sadly I am not sure wich one I did use :( I think alkohol extracts are better since alkohol gets out of herbs more and better absorbed.
So I don't know (taht's a good oppinion...)