- - Derived Naturally From Fossilized Coral.
Sourced from ultra-fine calcium powder which has been deposited on shore. Typically live coral reefs are protected by natural hard shells which eventually break away and become pulverized into this ultra-fine powder and is ultimately deposited above sea. These coral minerals are highly absorbable. Coral Calcium contains mostly calcium carbonate, though the presence of other trace minerals is important to the action of this mineral supplement.