Food grade Diatomaceous Earth

I put this in the consumer reports area, but figured this would be a good place as well for any veterinarians on the board that may have some information/experience.

I've heard of people using this for treating mammals (humans included) for internal and external parasites, as well as a way to kill of bug infestations in and around the home. I'm going to purchasing some for myself because of some spider and ant issues I'm having.

I'm wondering if this could also be used as a 'dewormer' or mite preventative/treatment for reptiles? Has anyone tried it? Currently I am not having any issues but would love to know if I could ad this to my 'Reptile First Aid Kit' for any issues, or to use as a preventative for new reptile purchases. It seems safe enough, especially considering it is chemical free, and all natural. I prefer not to use poisons/insecticides for several obvious reasons.

Here's a good site about it: http://wolfcreekranch1.tripod.com/defaq.html

Thanks!