Do you have a cat that has a sensitivity to both egg and chicken protein? Because the protein in egg isn't the same as the protein in chicken. Most pre-mixes have either yolk or eggshell. The only options if you're trying to avoid both is combining the supplements yourself or going with something like Balance It, which doesn't use any animal products, but it's expensive and hit or miss with some pets.Also, is anyone aware of a similar supplement that doesn't use *any* chicken products?