I've used just about everything over the years and come to the conclusion what a waste of good money.Resorted to Epsom salts, Carb Soda,Iodine,Cider Vinegar,Garlic,Ground Nut Oil and Glucose, that's about your lot.Just worked round them and saved a bomb.Must admit the young birds even though late have kept their health.Fingers crossed on that one.I do however have the usual treatments in the coupboard just incase.Lindsay
ps.Gary Spavins,bitter stimulant powder.