I hugely respect you, Nuthatched, and I sincerely appreciate every piece of advice you have posted. So I mean it when I ask: would you mind sharing why garlic is bad for chickens? I ask because it seemed to have worked for my birds in the past, but if that was a mistake, I would rather avoid...
My girl Kate got worms once; I chopped up garlic and mixed it in mash three times a day to give to my whole flock. Nobirdie else got it, and Kate hasn't had any issues since.