I don't know what it is but every time I find some type of a product that I like, it ends up being discontinued either by the business making it or being carried by my closest stores. Take Iams Natural cat food as an example, it is the only cat food that doesn't make one of my cats get sick. I don't understand why, I've tried other similar formulations of cat food but for some reason only that particular kind of cat food works for him. It was the same thing with my older cat Axle who recently passed away at age 18, he could only eat that brand as well. Now, the local grocery store that I shop at quit carrying it. Which means I have to either drive quite a few miles to the nearest pet food store or plan my pet food purchases better to be able to order the food online from a pet supplies store.
My husband's solution being the non-cat lover of the family is to get rid of that particular cat - which is not a possibility since I've had him for 8 years.