...I have to confess I had a bit of skepticism. I should have had more faith!! Within a day or so of using RTPR (I use the product in the jar at least twice a day, and use the roll-on when I can at work), the swelling in the back of my knee [had relief]...I even used RTPR on my lower back pain and that's relieved!! I am sharing the samples with friends who have had back and knee surgeries and are still in pain - despite heavy doses of pain killers. This purchase did not disappoint. I'm definitely going to keep using this product -- IT WORKS!!!