Dietary supplement. Source Naturals Coral Calcium/Magnesium contains a higher level of magnesium than the original Coral Calcium to provide the important alkaline minerals, calcium and magnesium, in a 2:1 ratio, as well as other trace minerals. An initial study on an alkaline mineral blend demonstrated an increase in blood alkalinity (pH) and buffering capacity. Proper alkalinity (pH) of the blood is critical for the overall health of the body (These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease). Source Naturals Coral Calcium/Magnesium : it is harvested in Olinawa, Japan from fossilized (dead) coral and is not harmful to living coral. Contains no yeast, dairy, egg, gluten, soy or wheat. Contains no sugar, starch, or artificial color, flavor or fragrance.