Antiperspirant is the stuff I can't use - I had heat stroke as a child and my internal thermostat is all mucked up. I don't like that I sweat so much, and wish I could use antiperspirant. Deodorant just cuts the odor (DUH!) but doesn't do anything to prevent sweating.
There is a great mineral that I wish I could find again. It was wonderful. You dampened the rock of whatever it was and rubbed it anywhere you got sweaty, armpits, under boobs, crotch, soles of your feet. You still sweat, but you didn't smell and you didn't get heat rash, either.
Right now I'm using Tom's Natural Deodorant. It's a stick, like any of the mass marketed deodorant sticks. NO scent. Works very well.
I just wish I wasn't such a sweater.....