Mineral Salt Stone is a Natural Deodorant. Alum stone, also known as potassium alum or ammonium alum, is a naturally occurring mineral salt that has been used for centuries as a natural deodorant and astringent. This powerful single ingredient deodorant stone blocks and eliminates unwanted body odor without any added harsh or harmful chemicals. For both men & women provides long-lasting, natural odor protection for up to 24 hrs. HOW TO USE Apply salt stick to freshly cleaned, wet or damp underarms, either after a shower or bath or after wetting the crystal itself. Rub the crystal on your underarms until dry, using a circular motion or rubbing it up and down. Be sure to keep the crystal dry between uses to extend its lifespan. INGREDIENTS 100% Natural Mineral Salts (potassium alum)