I really don't know about the special food.
When I was a little girl, my mother used to give the cat a good 'lick' of butter, or open a can of tuna/sardines etc in oil, and pour the oil on her food. It greased the hairball so it would either come up okay or go down okay.
(haha we often used to find sicked-up hairballs about the place eeeeewww!! LOL....and cats seem quite clever at sicking-up the right thing and leaving the stuff down inside which they want to keep....okay TMI!)
But as your cat gets older of course it's going to be harder to get rid of the hairball. I think it's a wise idea to make sure a long haired cat is combed well twice a day to lessen the amount of fur swallowed.
Sorry I can't be more help about the food.
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