What is it? Potassium alum, or potassium aluminum sulfate, is a naturally occurring mineral and the major component of deodorant crystal products.     #tawas #potasiumalum #alum #tawaspowder #powder What does it do? In our Mineral Confidence roll-on product, potassium alum functions to inhibit the growth of odor-causing bacteria and reducing unpleasant odor caused by skin bacteria when we sweat. Potassium alum does contain aluminum, so there is a low level of aluminum and we do not make the aluminum-free claim with this deodorant.  However, potassium alum it is not an antiperspirant ingredient and products containing it, such as our Mineral Confidence roll-on deodorant,