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. The OHC is combined with vitamin D3 and vitamin K2 as MK-7 from natural fermentation (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. Jarrow Formulas Bone-Up provides comprehensive supplemental nutritional support for maintaining strong, healthy bones.* Bone-Up has been a featured product of Jarrow Formulas for some time and has been updated through the years to reflect the latest scientific findings regarding skeletal health.