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Pure Lab Vitamins: Calcium Hydroxyapatite. An organically bound calcium complex with the built-in benefits of minerals and proteins that are naturally occurring in the bone matrix Here are the bare bones about calcium: it’s the most abundant mineral in the body. Although 98 percent of the body’s calcium is stored within the bones and teeth as calcium hydroxyapatite—where it adds density and strength—the mineral can also be found in the blood because it has other important biological functions.