Use to take an Calcium supplement-tasted too awful so quit....
Here is some info & the web site for Coral Calcium:
Why Coral Calcium ?
Because biologically all forms of calcium are not processed the same in your body.
Calcium is one of the more difficult elements for the body to digest and absorb and vitamin D is essential to calcium uptake. For example, calcium lactate - from dairy products, only yields about 30% absorbable calcium. Calcium carbonate only yields about 5% absorbable calcium - milk and antacids aren't the great source of calcium they are claimed to be!
Marine bed coral calcium is ionic calcium (Ca ++) and is the only physiologically active form of this element. This means the body doesn't have to convert the source into calcium. Our coral calcium is fortified with vitamin D, magnesium and 73 other essential minerals derived from the coral providing for nearly 100% absorbable calcium!
http://www.coral-calcium-factor.com/coral-calcium.html