Calcium supplements promote healthy bone density. Coral Calcium is sourced from coral and contains up to 74 different minerals that naturally mimic the mineral concentration of the human body. Nutrabio Coral Calcium is made from 100% EcoPure (EcoSafe) food-grade, ultra-micronized above sea Coral Calcium. This is the purest, contaminant free Coral Calcium in the world and contains no additives or fillers of any kind. EcoPure is the only Coral Calcium purified in an ozone chamber recognized by the FDA. Other companies use high heat sterilization which heats the coral calcium to over 1000 degrees turning the Coral Calcium into calcite. Each batch is laboratory-tested and assayed to ensure that you are getting 99.9% pure coral calcium.