Source Naturals Coral Calcium Multi-Mineral Complex is a rich blend of minerals from coral and other mineral sources. It contains high quality, highly assimilated forms of the minerals involved in hundreds of important metabolic reactions including bone formation, energy production, neurotransmitter activity and maintenance of blood alkalinity. 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. Source Naturals Coral Calcium Multi-Mineral Complex is eco-friendly: it is harvested in Okinawa, Japan from fossilized (dead) coral and is not harmful to living coral.