My suggestions for pasty butt are to drop the temperature in the brooder, or at least provide a cooler spot for them to get into. Temperature too high is one of the culprits causing pasty butt.
Add some ACV to their water. If you happen to be putting sugar into their water, stop that. It's only for the first day or two at the most. A touch of ACV in their water is good for them any time.
Wash their little bottoms and apply some vegetable oil (olive, for example) to their vent areas, and maybe clip the fuzz just below the vent.
I've never given chicks food items to "cure" pasty butt. I believe stress from shipping, temperature too high and dehydration are contributors.
I've ONLY encountered pasty butt in shipped chicks - or feed store chicks, which were shipped to the feed store from the hatcheries. Chicks hatched at home in an incubator have never, ever exhibited the problem. Going from the incubator to a properly warmed brooder is a matter of being carried across the room. No stress. Happy little babies.
That's just been my experience.