My Rocky is 14 yrs old. A couple of months ago I noticed that she was having trouble with her back leg joints and she couldn't jump like she use to. I took her to the vet and he recommended Cosequin for cats (you can only get it from Vets). Wow. She is back to being herself and jumping and running all over the place. Besides this I don't give her any other supplements. And you wouldn't give this unless your cat was having troubles. I also switched her from Science Diet Dry to Wellness canned food and I think that makes a difference too.