I just had an experience at the gym. Was talking to an older gentleman (81) and we were discussing our various ailments. So I mention I have arthritis, and he says I've got just the thing for you. and like that, he went to his locker and came back with some crystal menthol and a balm made from it. the crystal menthol looked similar to rock salt you put in your water softener (the pellets). When you smell it, it has a strong odor of menthol. Next thing you know, he's rubbing some of this balm into both my knees, and I have to admit, they are feeling pretty good right now. He wouldn't tell me what else he mixes with it to make the balm, as he makes and sells it. So I looked it up on the internet:
Menthol Crystals | Wholesale USP from Bulk Apothecary
he also said if you put a small flake in a Dixie cup, and add hot water and bring in the sauna with you, the entire sauna will smell like menthol, and damn if it don't clear the sinuses! It apparently has a melting point lower than body temperature.
I think it would be fairly easy to figure out how to make your own balm, so I won't be buying any from the gentleman, but it was good to learn something today. it apparently great for those nagging aches and pains and provides pretty good temporary relief. not sure about the long term curative properties he was trying to sell me, like it cured the arthritis in his arm, but it does seem to have some short term qualities.