Effective, but I can't use it.
I used this product a few times and it undoubtedly did help with armpit sweat; however it quickly led to a much worse and troublesome problem. I broke out in hives all over my body, not just where I used the product (on my underarm), but my arms, legs, chest, stomach, everywhere! I tried everything under the sun to get the itching to stop with no success. I ended up having to go to my dermatologist and $200+ later (between office visit and prescriptions) I finally found relief. As much as dry armpits would be nice this turned out to be a very bad and expensive experience for me. I still gave it two stars because if you are lucky enough not to be allergic to it, it would probably be a wonderful thing! Btw, I did read all the instructions and use as prescribed.