Coral Calcium?

I just read the post here on Coral Calcium, and was wondering which is the best brand to buy? With so many brands, I really don't know which one is the absolute best? (you know,- "the real thing"...) I'd like to be able to buy it at my local health food store, because it's just quicker. But, if I have to, I can order it over the internet as well. I just don't know which one is the best. According to my dr., my bones seem to be degenerating, on my spine, and my jaw.! Plus, my 15yr. old daughter has just been diagnosed with the same problem! so, if anyone can help us, I sure would appreciate it! God Bless! KellyW