This is geniune, original Coral Calcium, from Okinawa, Japan, where many people live to 100 years old! One of the most absorbable forms of calcium Superior quality 100% pure No living coral is harmed in the making of this product According to the National Institute of Health: Women from 50 to 64 years, (post-menopausal and not taking estrogen or a similar hormone) need 1,000 mg. of calcium daily. Men from 25 to 64 years need 1,000 mg of calcium daily. Two powerful capsules give you: Vitamin D - 800 IU Calcium - 500 mg Magnesium - 250 mg