Not exactly. It's that no one has ever shown a legitimate study that it does work. The way DE works logically says it will not work (desiccant properties and sharp edges don’t work when it is wet and the guts of a chicken are wet), and several people on this forum that have had an actual worm infection have tried it and reported that it did not work. Several people say Oh I use it and my chickens don’t have worms. That proves absolutely nothing. I don’t use it and my chickens don’t have worms. My chickens spend their days on the ground.
