According to what I read on the net, some of the food grade diat. earth varieties are safer than others. Some zoos are experimenting with it to deworm animals. The problem is that you have no idea what grade the stuff you are buying is, so you are taking a chance. I haven't even seem much about human use. I would not use it.

I have had good results with Kroeger Wormwood Combination, although any formala that has wormwood, black walnut green hull extract, and clove will probably work. You should also eat plenty of raw garlic. That is an excellent antiparasitic. So is ginger. I use ginger oil rather than raw ginger, but eat raw garlic.