IMO the problem with any medication where active ingredients etc aren't listed is... you don't know whats in it (wot, really?).
If it works, it must have some kind of active ingredient, a naturally-occuring chemical in it. This i something which will kill parasites, and it might be doing something very nasty which will affect other things in the tank.
IMO: just becuase it's organic or naturally occuring doesn't make it safe or nice or gentle. There are plenty of naturally occuring toxins, and poisons, as well as man-made ones. Lots of manufacturers get away with badly-tested products on the market because they are based on naturally-occuring chemicals. Am not saying all are bad.
I think it's good to try new things, but personally, given that no-one has been able to say, "yep, it's great!" I wouldn't want to be among the first to give it a go and hope for the best.