Aluminum chloride hexahydrate
"To be honest this is the best thing that's ever happened to me, drysol is the bomb. I had used hypercare before drysol which worked just as good but was discontinued right after I finished my first bottle and supposedly cannot be bought anywhere anymore. I was back to my armpits gushing sweat within a few days and thought all hope was lost, until I found out about drysol. It has completely stopped my underarms from sweating and I am very happy. I hope drysol sticks around forever. If you have a problem with profuse sweating under your arms get drysol and your problem is solved."