From the Manufacturer:
"A comprehensive bone support formula that helps build and maintain good bone health.*
An excellent source of MCHA calcium, along with a broad spectrum of vital minerals and nutritional cofactors to help support healthy bone density.*
MCHA or Microcrystalline Hydroxyapatite is a highly absorbable, body friendly form of calcium. MCHA used in Living Calcium™ Advanced is derived from Australian, grass-fed, free-range cattle. MCHA calcium provides the mineral matrix of living bone including magnesium and phosphorus that helps support healthy calcium and bone metabolism."