NOW Colloidal Minerals is a unique source of highly absorbable, water-soluble minerals derived from prehistoric plant deposits in Utah. Each 1 ounce serving contains trace levels of many major and trace minerals. These colloidal minerals were created ages ago when they became incorporated into the living plants, fruits and vegetables of that era. These trace elements helped to form the luscious vegetarian which contributed to the vibrant life which flourished on this planet.