I haven't tried anything performance enhancing stuff, and I'm not into it.. I was just writing a paper for school about how skateboarding doesn't have any (at least that I could find) performance enhancing apparel stuff even though skateboarding is pretty god damn hard on your body compared to a lot of sports and other types of activities.
I mean, if the stuff works, it could mean that you would be able to skate for longer periods of time without getting all sore and shit, or it could speed up your after-skate recovery. Most research are inconclusive if the stuff really works or not, but the popularity outside of it (except for skateboarding) is pretty damn clear.