I use DE on my cats to keep fleas down. Is food grade DE bad to breathe in? I've read in some places that FGDE is OK to breathe in.
This!DE is bad to breath in. It is basically little tiny sharp glass like particles. Our skin and digestive tract is made to handle tough stuff like that, our lungs are far too sensitive and thin for that. So be very careful not to release it into the air when applying.