Yeah, I don't know. Herbert Buhner wrote about this herb in his book titled "Herbal Antibiotics ". I can try to paraphrase a little bit of it but mostly it said the first round would be the most effective. The subsequent rounds it wouldn't be as useful. I don't know why. From my experience this has been the case. The first 5 days I used it, I felt like it was really doing a number on the parasites. When I used it thereafter I "felt" like it wasnt' doing much at all. Coupled with the fact that it can be a neurotoxin at high dosages. Which my daily intake of the herb at that time is considered high dosage. 2000-3000mg per day, which is too much. I haven't really gone back to it. It would be interesting to see how I would react. Just my two cents.
David