Aluminum is not particularly good for living organisms especially man made aluminum.
Aluminum Chlorohydrate is a synethic ingredient of many anti-perspirants and artificially impedes one of the bodies natural processes – sweat formation. It blocks our ability to excrete sweat therefore our body no longer can naturally use sweating as cooling mechanism or as a way to expel toxins.
There are lots of natural deodrants/antiperspirants – Salt of the Earth, Weleda and the Jason range
to name but a few.