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Crystal

One potassium alum stone. It replaces your entire deodorant aisle, and it means it.

Alum is an aluminium salt. So "aluminium-free" was never the claim here, whatever you assumed on the shelf. The claim is that it is not an antiperspirant. Nothing plugs a sweat duct. The mineral film just makes your skin a poor host for the bacteria that turn sweat into odour. The formal evidence is modest. The mechanism is plain chemistry. One stone lasts about a year.