Our family all take an omega brand that is FDA approved. Our Vet also told us to give our cats fish oil occasionally, so yes our cats take them too. We don't eat fish much at all, so whenever we eat fish at least twice a week we cut down on taking the supplements on those days. Fish oils helped my father lower his cholesterol, and he's a steadfast believer in the stuff. I also believe that it helps my moods, since I used to have severe mood swings and now its so much better. I have no real proof but its just what happened to me.