Healthy pH Balance Important for Bone Health 350 mg of Calcium Non-GMO A Dietary Supplement Kosher Minerals Family Owned since 1968 GMP Quality Assured NOW Coral Calcium is an excellent source of an alkaline form of Calcium that can help to support a healthy serum pH. In addition, Coral Calcium has naturally occurring trace minerals that are important for bone health, as well as for optimal enzymatic activity. NOW 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.