MCHA for Bone & Teeth Structure With Additional Minerals from Comprehensive Support A Dietary Supplement How it works: Microcrystalline hydroxyapatite (MCHA) is a natural compound that makes up the crystalline matrix of bone and teeth, and is the substance that gives them their rigidity. MCHA consists of highly absorbable calcium and phosphorus, which are the major mineral components of bone. Bone Support Formula is a comprehensive bone support product that includes Magnesium and trace minerals, as well as vitamins C, D and K2 to aid in the synthesis and maintenance of healthy bone tissue.