If your cat is allergic to a particular protein, do you need to eliminate absolutely everything that's related or derived from that protein source? Or does it just depend on your cat? For example, if your cat is allergic to chicken, does that mean that egg yolk lecithin is off the table, or a supplement that contains hydrolyzed chicken liver as an ingredient? Or if your cat is allergic to beef, do you need to avoid anything that contains any product derived from bovine colostrum, or capsules made from beef gelatin? That sort of thing. We're making progress as far as diet goes, but we want to make sure we don't inadvertently sabotage our efforts with any supplements or anything else that might be a little too close for comfort.