I have osteoarthritis, knees and neck are the worst for me. I use Schiff's Move Free (glucosamine and chondroiton), ibuprofen, and prescription naproxen. Other than that, I can't add what's already been said: regular exercise helps tons!

BTW, Sweet n Low used for any length of time will result in muscle collapse; doctors will often diagnose it as mulitple sclerosis or something else, the physical therapists are the ones who realize you need to stop the Sweet n Low and the muscles will recover strength with a bit of physical therapy.