Food Science of Vermont"s coral calcium plus is a dietary supplement to support bone health and proper PH balance. It is made with the highest grade above sea coral from caribbean. It contains 800 mg of elemental calcium and trace levels of 74 other minerals that are naturally chelated organically bound for maximum assimilation. We"ve added enough magnesium to provide the recommended 2:1 ratio of calcium to magnesium along with boron, manganese, vitamins D and C, beta carotene and copper for optimal support.