clipped from: lighterfootstep.com   
Specifically, let's talk about something you probably put on your armpits every morning: deodorants and antiperspirants. These B.O. blasters come in almost every scent imaginable, in forms from roll-ons to clear gels. Your supermarket aisle probably stocks two dozen varieties.

Almost every one will have something in common: aluminum chlorohdrate or aluminum zirconium. And that could be a problem

Natural health groups have been pressing government and regulatory agencies for years to take a hard look at the long-term safety of aluminum in cosmetic products. Aluminum is what gives antiperspirants their wetness-fighting ability, and they're highly effective. Commercial deodorants can contain up to 25% aluminum salts by weight.

The problem is this: nobody really knows what aluminum does in the human body. In the case of deodorants, you're applying aluminum directly to the skin and leaving it there. With women, in particular, that skin might be broken from shaving.