The secret is it WORKS! I'd been using the same antiperspirant for years, the only one that worked, and then it stopped working. Wet spots under my arms. So the other day I decided to try the new "Secret Clinical Strength" (the one I chose was WATERPROOF...figured I need all it could give me), and I am sold! It really works!
It says to use it morning and night, but I didn't last night. Normally, I'd already be sweating under my arms, and I haven't even worked out. But I'm not. Same ingredient as what I was using, only 20% instead of 14%.