Chemically, Deodorants Stink
Heidi Sopinka of the Globe and Mail looks at the chemical composition of deodorants, even from the health food store, and asks "Is it possible to obliterate body odour and be good to the planet?" and concludes that it is pretty tough. 50% of "natural" deodorants contain petroleum-based propylene glycol; others contain gender bender triclosan, parabens, and talc, which is illegally mined in India.
She concludes: Avoid antiperspirants entirely, and if after reading the label you find no mention of parabens, talc or propylene glycol, you're on the right track. You might have to arrange for emergency reapplications throughout the day, but it beats the environmental price of coming clean. ::Globe and Mail