In response to Catherine Connell.... apparently she didn't read the book very carefully. They do not rob the protected coral reefs in Japan in order to make the coral calcium product. The government of Japan has crews that go and remove the eroded coral sand from the reefs to protect them and keep them healthy and the coral calcium comes from that. Robert Barefoot's science is sound. If people take the coral calcium and don't have a good response or any response it wouldn't take long for Mr. Barefoot to be out of business. What is the medical community afraid of? It would not be the first time that there has been a sound natural nutritional answer to preventing and curing disease. I applaud those trying to help people live healthier and better lives through nutrition.