I did my own home testing with some of the Coral Calcium products. Coral calcium supreme did not fair very well and they were just simple tests. I'm just an everyday joe, trying to find out what's best for my body. I've learned an awful lot from research. And also found that Mr. Barefoot has his hands in many cookie jars so to speak. He is a veryyy knowledgeable man when it comes to Coral Calcium, but he ethics seem questionable to me, but that is my opinion. I have a page of information on different coral calciums and how they stood up to the test I've done, if you'd like them, please email me and I will send you the results. marshac@execulink.com