Coral calcium contains the alkaline minerals, calcium, magnesium and other essential 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. Even slight pH variations - that is, more acidity - can result in imbalances such as candida, indigestion, seasonal sensitivities, and low immune function. Source Naturals Coral Calcium is Eco-Friendly. Unlike ocean-harvested coral calcium, it is harvested from an above-sea source: fossilized coral on the coral island of Okinawa.