DMSO:
It's a product from Tree sap basically. It works as a solvent and also as a lubricant for sore or aching joints. Further it can be used as a transdermal delivery mechanism since it basically goes all the way through your body. So if you use it you need to make damn sure that the applciation area is germ and bug free.
I've used it on occassion for several years and it does work well on aches and pains. As a transdermal I've had mixed results. So its use there is sketchy at best.
Just do a google search on DMSO and you'll find places that sell it over the web if you're interested.
Like I said it does create a fowl body and breath odor on the user.