I use Diotomacious Earth as a wormer... no holding back on eggs when you use all natural cures. Just every month or so (i'm not so strict on these things) I add it to their food for 3 days straight. Never had a problem. Make sure to get "food grade" DE... it is safe for them to injest. I use DE also for dust bathes for them, and even add it to their coop floors and perches to get lice and mites and anything else bug wise.