My wife uses crystal deodorant, and it works well. The only catch, and it may be in the instructions, is that it really only works after you're clean. So, you can't put it on a dirty, smelly body to cover up any odors. It lasts the day like normal, but you'll need to shower again the next morning, then reapply. FWIW, she's had the same "crystal" for about six months now.