This might not be the most popular suggestion, but I think that cutting the supplements, and switching to a basic balanced commercial chicken feed would be the best place to start. Let them free range in the yard, but cut out the dairy, greens, and fruits for a while. Add them back slowly and in much smaller quantities after a few months. Then, if there are still any issues it can be treated. I don’t see anything in this supplement that would be an effective treatment for worms or coccidia, or most other chicken health issues. And some of the ingredients wouldn’t be something a chicken would naturally be consuming anyways. Just my two cents. And I completely understand the issues with finding a good and affordable vet that will treat poultry. It’s a huge struggle here as well.