Salts of calcium that are obtained from fossilized coral reefs are known as coral calcium. Coral calcium is acquired by grinding up limestone, which is found above the ground and was once part of the coral reef. Living coral reefs cannot be harvested because they are endangered. The subjects were divided into three groups, one of which ingested crackers with coral based calcium added, and another of which ingested similar crackers with carbonate calcium. The third group served as a control, and did not ingest any crackers, whatsoever.
Read more about coral calcium and harvesting marine coral calcium

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