I had a rather bad knee problem that kept me from doing squats. When I woke up and got out of bed my knees would pop and it kinda hurt pretty bad. I bought some of this stuff from the mr nutrition near my house. It works pretty well. It was actually cheaper there than online. Id reccomend this for knee problems, never tried it for any other injury.

Mozilla/5.0 (Danger hiptop 4.7; U; rv:1.7.12) Gecko/20050920