Crystal deodorant is a type of alternative deodorant made of natural mineral salt called Potassium alum,which has been shown to have antimicrobial properties. Potassium alum has been used as a deodorant in Southeast Asia for hundreds of years.
The salt in crystal deodorant helps to kill bacteria that cause underarm odor. While you may still sweat, the odor may be reduced or eliminated.
The best time to apply the deodorant is right after you shower or bathe, when your underarms are freshly cleaned and still slightly damp. Run the stone under water and then apply. Crystal deodorant may be effective for up to 24 hours.