We probably need more Calcium and Magnesium than any other vitamin or mineral. Yet Calcium remains high on the list of mineral in which people are deficient. Calcium deficiency results largely from poor absorption. Tropical Coral Calcium is specially formulated for optimal assimilation because minerals, especially calcium, can be very difficult to get into the blood stream. Coral minerals are naturally ionized allowing for almost total bioavailability. Tropical Coral Calcium includes a blend of minerals, vitamin D (which must be present for absorption to occur), and Magnesium which is vital for calcium to absorb. Helps maintain a healthy PH balance too!