Using wood ashes for your chickens saves money. (fireplace ash only, not BBQ coals, etc) and when needed, mix 2 parts ash to 1 part sand for the chickens to do their dust bathing. It keeps mites away. That and paint the coop with hydrated lime.
Pumpkin seeds are a natural de-wormer for chickens and I had one small pumpkin still rolling around the yard from last fall. I cut it open and ground up the guts and seeds in the food processor and fed to the chickens.