Cal Apatite® Bone Builder® with 0.2% Boron provides excellent 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 calcium and other minerals, bone growth factors, and collagen and other vital bone proteins. This well-rounded formula is designed to support bone mineral density and also features boron, which may play a role in maintaining healthy calcium balance through involvement in mineral metabolism.