Crystal Roll-On Body Deodorant
Fresh pits are indeed ladylike, and studies have found that avoiding deodorants with aluminum and parabens is essential for healthy breast tissue. This one, made of natural mineral salts, won't keep you from sweating completely, but it does create a barrier against odor-causing bacteria. It's got no aluminum, no propylene glycol (which is basically anti-freeze), hypoallergenic, fragrance-free, and is non-sticky. Apply immediately after bathing for best effect.
Drugstore.com, $4