i have a suggestion for you, looks like you have tried a lot of things and not a lot of luck. i have been giving my cats purina Naturals Plus Vitamins and Minerals which comes in green bag. this product has done wonders for my cat, they love it and appetite is great and it is well balanced nutrition with no artificial flavors. i have been giving them for 3 years and i have not seen any problem except if it causes by other sickneses.
it won't hurt to try it. it is not very expensive. you can do a little more research about this product online if you like.
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