Microcrystalline Hydroxyapatite (MCHA) is a compound that normally makes up the crystalline matrix of bone and teeth and is the substance that gives them their rigidity.* MCHA contains highly absorbable Calcium and Phosphorus, which are the major mineral components of bone.* NOW? Bone Strength? is a comprehensive bone support product with MCHA.* It also provides Magnesium and other important minerals, as well as Vitamins C, D, and K to aid in the synthesis and maintenance of bone tissue.* Now Microcrystalline Hydroxyapatite (MCHA) is derived exclusively from Australian cattle. VitaGen is NOT responsible for any and all packages detained/impounded/or returned to us by the country’s respective Customs Department. It is the FULL responsibility of the customer to ensure.