BONE-UP provides ossein hydroxyapatite complex (OHC) (from free-range Australian/New Zealand calves); which includes the superior combination of the inorganic calcium lattice of microcrystalline hydroxyapatite (MCHA) within an organic protein milieu rich in naturally occurring growth factors. The OHC is combined with vitamin D3 and vitamin K2 as MK-7 (a more bioavailable form of vitamin K) to support the deposition of calcium into the bones as well as to assist in building up the organic bone matrix.* Potassium citrate is also added for optimal osteo support.*HEALTH CLAIM: Adequate calcium and vitamin D as part of a healthful diet; along with physical activity; may reduce the risk of osteoporosis later in life. For best results; use with Jarrow FORMULAS JarroSil ; the biologically Activated Silicon .Keep out of the reach of children.