Joint supplement not working, what would be best to help with pain?

[Brittany Y]

I've got my young gelding on Smartflex Senior, which has got Chondrotin, Glucosamine and a couple of anti inflamatories like Devil's Claw and Yucca. It doesn't seem to be doing much good, and he's still pretty gimpy. I'm looking into buying him something more to help with pain, in addition to the joint supplements, and I was wondering if anyone had any suggestions. I know I've been told that bute and Devil's Claw shouldn't be fed together for long periods of time, but I don't know what else would be best. I looked on smartpakequine and they've got everything from more Yucca and Devil's claw to something called nobute and MSM. Anyone have any suggestions?

Also I want to mention that I'm NOT riding him, and I'm NOT planning on it. His arthritis is way too bad, so please don't even bother answering if you're going to tell me to get him joint injections. Right now I'm just looking for something to help him with pain.