I tested with them with no results but ParaWellness found them - although lately I have read some positive results from Amin.
It is somewhat important to identify the culprits that is are they parasites, if so which category (nematode, protozoa etc). Could be a stubborn bacteria, virus or yeast.
A very good trick I have learned is that you carpet bomb meaning you take formulas designed for bacteria or parasites etc. Not a good idea to rely on single herbs or even single complexes. If you hit it right then you should see some results within a week or so, if not move on to the next formula.