As a martial artist from childhood, I grew up on this stuff. I just thought I would bring it up since one of my students mentioned it today. She has been a student of mine for years and I always see her sporting a pair of knee braces from old injuries. The past two weeks, she has been coming to class without. So today, she asked if I noticed. To which I told her for the last two weeks. She then told me that she has been using dit da jow. Dit da jow - Wikipedia Not just any dit da jow, but one of the famous Wong Fei Hung's recipe. She got it from the Wong family through a relative. Wong Fei-hung - Wikipedia Long story short, she has been rubbing it in twice a day for 30 minutes a time and now is free of knee pain. I asked her to find out if she can buy some more as I would buy it. I had another famous one, but all gone. And another made by one of my teachers, but that is gone too. I had two teachers that made it. One was a bonesetter and the other an acupuncturist. Sadly, both have passed on. I was too young and stupid at the time to get their recipes.