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Metagenics Cal Apatite Bone Builder formulas, except the vegetarian formula, provide bone health support with microcrystalline hydroxyapatite concentrate (MCHC), a highly absorbable crystalline compound that provides everything found in healthy bones and is backed by more than 30 years of research. MCHC contains naturally occurring calcium, phosphorus, and trace amounts of other minerals, bone growth factors, collagen and other vital bone proteins. The Cal Apatite Bone Builder Vegetarian features a ratio-balanced blend of calcium and magnesium to support bone density and muscle health. Magnesium works together with calcium to support bone health and muscle relaxation.