Daily Coral Calcium is the highest quality of Coral. Coral calcium is taken from land deposits of ancient coral, thereby assuring that ocean coral reefs are not disturbed. Coral calcium from land deposits ancient coral, thereby assuring that coral reefs in the ocean are not disturbed. Coral calcium from land deposits are free of pollutants that were introduced by man into the ocean, because the coral was formed long before modern man was there. All Daily coral products are mined and processed by strict pharmaceutical standards, and further processed and packaged under strict American standards at Daily Manufacturing's FDA inspected facility. Daily Coral Calcium, Magnesium & Vitamin D3 is ground extremely fine (7-10 micron): assuring that all of the calcium forms a colloidal suspension and is easily absorbed. Each 1/2 tsp. provides: Coral Calcium Powder 345 mg, Magnesium 175 mg, Vitamin D3 3.45 mcg (138IU). (No Excipients) There are 95 servings per 5 oz jar of powder.