NOW CORAL CALCIUM PLUS CAPSULE In addition, the product contains many trace minerals, which are important for healthy bones and the most favorable enzyme activity. The raw material for the Now Coral Calcium product is not collected on living coral reefs, not even from the ocean, but from surface sources in Okinawa, and in an environmentally friendly way. Magnesium and vitamin D are added to this Coral Calcium Plus composition, as they are essential for bone metabolism.