I found this at a health food store. It is hypoallergenic, unscented, non-staining and says it lasts 24 hours. It is a natural crystal that you run under water, apply to your underarms and let dry a few seconds. When I started using this it was in the winter months and I found that it worked very well. I loved it because it didn't stain my clothes like other anti-perspient/deodorants do and no icky build up. When I got into the summer months and started playing more sports in the heat I found that it didn't do as good of a job keeping me smelling fresh. I went back to regular deodorants. I do plan to go back to it and give it another try though. It is more expensive than regular deodorants, but lasts a very long time. I think one crystal could last a year.