I can tell you first hand that Coral Calcium has helped hundreds, probably thousands, of people with countless diseases that they thought would be the end of them being able to live a productive life. How do I know this, well I used to help run one of the largest companies in the US that marketed this product through infomercials. I have met Bob Barefoot, the creator of Coral Calcium, and I have to tell you that I have never met someone more passionate about what they do for a living. In closing, I would say pick up a bottle off of one of the infomercials you see and have your parents try it out. Anything that could help someone as much as this have helped some people is worth a try IMO.
Disclaimer: I am no longer involved with the marketing of Coral Calcium and in no way benefit financially from any product sold via TV or radio. Also, the opinions expressed are of my own, and are not to be treated as medical advice as I am not a medical proffesional.