Magnesium trisilicate is a common ingredient found in medicines to treat indigestion. It is used widely in cosmetics as an absorbent and anti-caking agent and occurs in nature in combination with other minerals. Magnesium trisilicate is used in some of our deodorant powders for both the free-flowing and super absorbent qualities. It is ideal to absorb moisture and to keep you fresh and dry, both under the arms and between the toes.