DON'T USE!
I  used this as directed on the calluses on my feet.  It worked well, my feet are nice and smooth, but afterwards (for at least 2 weeks now) I have pain everywhere I used it, and can not walk without extreme pain.  I had chemical burns and had to go to my doctor.  They didn't look like burns, but that is what happened.  I suggest sticking with pumice stone or other less aggressive ways to remove calluses.  It wasn't worth it.  I would rather have less than pretty feet and be able to walk!
Rating: 1 stars