Although studies are still fairly limited, they seem to be helpful for some cats. The important thing is to use a product recommended by your veterinarian.
May 2017 - Over the last two decades, probiotics have become a hot topic in both human and veterinary medicine. An enormous body of research has clearly indicated that probiotics can cause a positive change in the intestinal bacterial population when pathogenic bacteria overtake the gastrointestinal tract. Probiotics have also been shown to have a beneficial effect on the immune system.