Clearly works for others, not for me
My 8 year old Maine Coon has an occasional upset stomach so I thought I'd try him on this (he otherwise likes Concept for Life Maine Coon food and Royal Canin). He immediately had bad diarrhrea which was an alarming yellow for 2 days so I took him off it. A week later I accidentally gave him another packet with similar results (colour less alarming, but smell was against the Geneva Convention). From other reviews this product clearly works for many cats, but it may not be for all cats!