I recommend deodorant crystals to anyone who can't or doesn't want to use deodorants. It's some kind of mineral that is formed in to a rock-like thing. You wet it and rub it on. I've been using them for years. They have no scent of their own, and they completely prevent any kind of underarm odor on me for a minimum of two days (very good for music festivals that don't have good shower facilities). Plus, they last a long time. You only have to buy them once every year or two.