There are multiple sources of calcium and many brands of calcium. Regardless of the multiple brands and forms of calcium, some forms of calcium are better absorbed. This raises the subject of coral calcium. Coral calcium is simply calcium carbonate derived from coral beds. What's so special about coral calcium? Well, it is said to be better absorbed by the human gut, thus giving you more of what you truly need or even more bang for your buck. You be the judge. For more details, visit https://knowaboutcalciumsalts.tumblr.com/post/667058948121182208/facts-you-should-know-about-coral-calcium