Just for fun ... I have been using something called Yoga Body Stretch for quite some time now. I don't often recommend products to students, but this one is great for joints and seems to improve over all functions, especially if you are slightly over 21. Largely MSM, and very effective.
They asked for comments about their product and I sent in mine. They asked for my photo and permission to post my comments and photo. Have a peek ... you have to scroll way down the page here: