NOW&ampreg; Coral Calcium contains an alkaline form of Calcium that can help to support a healthy serum pH.&ampnbsp; In addition,&ampnbsp;Coral Calcium has naturally occurring&ampnbsp;trace minerals that are important for bone health, as well as for optimal enzymatic activity.*&ampnbsp; NOW&ampreg; Coral Calcium is not harvested from living coral reefs or even from the ocean environment, but from above-ground sources in an ecologically friendly manner.