NOW Colloidal Minerals is comprised of highly absorbable, water-soluble minerals derived from prehistoric plant deposits in Utah. Each 1 ounce serving has naturally occurring trace amounts 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 vegetation which contributed to the vibrant life which flourished on this planet. The following minerals occur naturally in fulvic acid: Boron, Calcium, Chromium, Copper, Iron, Magnesium, Manganese, Molybdenum, Phosphorus, Potassium, Selenium, Silver, Sodium, Sulfur, and Zinc. Take 2 tablespoons (1 fl. oz.) daily in juice or water. Shake well before use. Refrigerate after opening.