Dietary Supplement Authentic Okinawa Coral Calcium Eco-Friendly Over 72 Trace Minerals A Balanced Source of Calcium & Magnesium Plus Vitamin D for Healthy Bones21st Century"s Eco-Friendly CoraCal has the ideal Calcium Magnesium ratio of 2:1 for proper bone support, to promote healthy heart, nerve and muscle function. No live Coral was harmed in the harvesting of 21st Century"s Eco-Friendly CoraCal.