I wouldn't use it. I bought some and could never tell that it killed any bugs.I have good soil here and haven’t ever seen any just didn’t know if I should go ahead and do it anyways I’ve heard diatomaceous earth works but that’s just what I’ve read.
And is totally usless once wet.
Therefore I don't know how it could work as a wormer since the inside of a chicken would be, ya know, wet.
Lots of folks swear by the stuff. But lots of folks swear by feeding pumpkin seeds or cayanne pepper too. I doubt if any of that does anything.