GNC Coral Calcium: Support Bone Health GNC Coral Calcium Capsules Are Created From Fossilized Coral Found In The Okinawa Sea. Created From Fossilized Animal Remnants, Coral Reefs Provide An All-Natural Source Of Calcium. While It Is Similar To The Calcium Carbonate Found In Rock Formations, This GNC Coral Calcium Supplement Has Magnesium And Other Trace Elements That Help Good Bone Health. Calcium May Reduce The Risk Of Osteoporosis. Magnesium & Vitamin D-3 Naturally Supplies Calcium, Magesium & Other Trace Minerals Essential For Strong, Healthy Bones Derived From Fossilize Coral Take Two Coral Calcium Capsules A Day Gluten Free | GNC Coral Calcium Healthy - 180 Capsules (90 Servings)