hmm, crow watcher and lollicandy and if there are others who have their doubts about the salt crystal, my personal experience with it is that it doesn't erase or prevent smell if there is already perspiration to begin with. But as long as I start off freshly washed, it works to maintain that all day. HTH!
In any case, I must say the best deodorant for me has been excercise. As long as I keep the perspiration glands reasonably active, I don't have to worry about smelling sweaty even after a heavy workout. Honestly, it seems I hardly need deodorant anymore, I just like to use it once in a while to freshen up before going out. Maybe I'm just really lucky, but I'm sure I'm not the only one. Really interesting.