If you mean diatomaceous earth, yes we do. We find it keeps the mites done in their coops/runs and if they eggs get too poopy, we find that it is a natural de-wormer that cleans ups the eggs, and if you want to eat them you still can safely. However, when a coop is cleaned I recommend wearing a good mask. The chickens freak when you put it down and beat their wings and it causes a dust storm. It is not toxic, but it will dry out your mucous membranes the same way it dries out bugs that irritate your birds.
I know about and use DE. Here is a picture of what I am talking about:

My rooster has been limping for the past few days. I've been soaking his foot (no bumblefoot) in epsom salt and putting castor oil on it. His pad is slightly swollen. I've been reading about DMSO and that there are people who use it on their chickens, horses, and even themselves. I was curious to see if you had ever heard of it.