I can verify how bad a con from worm counts done on a pony that had been treated with it twice while others were given standard wormers. They came back under 200 eggs per gram, most less than 50 eggs seen, some with none seen at all, she was 2600 epg on the same grazing, same period
To be fair, I think the instuctions for VermX is that it has to be fed every month for a period rather than "treated" once or twice a year as you would do with a chemical wormer, although that might be what you mean.
Sorry I should have been clearer, the VermX used was on a pony, over two worming periods as per dosage stated (it was 5 consecutive days of pellets per one single tube wormer equivalent) and redone at equine worming interval so 10 days in all over just under 10 weeks and the worm burden at that point was too high and risky to leave any longer as it was a breeding mare and the worms would go into the foal. So on veterinary and lab advice I dosed her with proper wormer, complained to the company with evidence from Westgate Labs on comparable animals.
I note they no longer claim to treat worms but only to help assist in digestive balance or some such rubbish. Clinically it doesn't work and they've been forced to remove the claims by trading standards or some such, I am told.
I've never tried it on hens and never will, the gist of my earlier post. Sorry for any misunderstanding, I'm not that clear headed sometimes