Aluminum chloride hexahydrate
"I'm 38 years old and I'm wish I had found this sooner. I remember going to the Prom and being so embarrassed because I was sweating so much I didn't want to lift my arms up to dance.  I've only used it for 4 days (every other day) and I just can't believe it!  I put it on the first night - a little burning but it wasn't that bad.  The next morning I was so scared to go anywhere without a regular deodorant but I couldn't believe I didn't sweat the whole day!  It really works!  I've been stuck trying tons of regular deodorants over the years and nothing has worked.  I'm dry and smell good now."