Your body needs more than just calcium so CORALadvantage is more than just a calcium supplement. Taking calcium as an isolated mineral can throw the other minerals out of balance. CORALadvantage is a balanced calcium, mineral and trace mineral supplement with bioavailable organic (citrate, chelate and plant source) forms of nine essential minerals. To further aid absorption and utilization of the minerals, our Full Spectrum Support Nutrient System has 21 support nutrients to improve the absorption and utilization of calcium and other minerals, included boron, lysine, manganese, and Vitamins D, E and K. Each serving contains 1000mg of marine coral from Okinawa, Japan. Suggested Use: take 3 capsules per day with meals. One bottle is a one month supply.