Review (3/5): For the love of your skin, apply carefully.
Reduces sweat very well, but if you apply too much or to sensitive skin, settle in for a night of itching, burning, and thinking, "Maybe pit stains aren't so bad....". I got a big, nasty, scabby patch of dermatitis around my armpit that lasted for at least 2 weeks. If applied sparingly, however, it's not bad at all. So just, you know, don't get overzealous with it, and you'll probably be fine.