Alum stone - Natural deodorant:

Simple, effective, long-lasting... and economical, Alum stone will very advantageously replace deodorants in bombs, sticks, rolls, sprays...

Alum stone has antiseptic properties, preventing the development of bacteria, the source of bad smells, as well as astringent properties, which naturally limit sweating without blocking it.

This stone used moistened with cold water is also effective in soothing razor burn. Another alternative to chemical deodorants: baking soda which masks the smell of perspiration.