I had it for my chickens for mites. I didn't want to use chemicals on them as they were layers and some we processed and canned. I had also planned to use in my house for fleas. I didn't want to use flea spray on my indoor pets, but somehow we never had a problem with that. Since I've been doing the emergency prep thing for quite a few years now, I remember before DE was regulated. The site where I got mine from had put up a post on their site saying the g o v was forcing them to put warning labels on it. The info I read while researching then (10+ years ago) was that when the DE becomes moist or wet, the spiky part of the minerals collapse. Only in rare instances would someone have an issue with breathing the dust as an irritant and it would have to be someone with poor lung function in a huge cloud- since we are moist inside!. I do not know if it is processed differently now or if the g o v forces them into labels like that. I would call the company and ask.