My right knee was slowly over two years becoming more and more painful on stairs and bending motions. My buddy suggested RTPR, claiming he swore by it. He told me to try it for two weeks, if I wasn't happy with the results he would buy the ointment from me. So with that money back guarantee, I bought a pump bottle. I was amazed at the results. I'm the skeptical type, but there's no arguing with results. That was twenty-six months ago, I use it once daily on my knees. Bicycling, treadmill, hiking are all 99% pain free activities. I am a believer. 64 years young customer.