Bone-Up® provides StimuCal™ ossein MicroCrystalline HydroxyApatite (MCHA) Complex (from free-range New Zealand calves). StimuCal™ also provides bone proteins, including type I collagen. Also contains Vitamin K2, Vitamin D3, Potassium, Calcium, Magnesium, Vitamin C, Copper and Manganese.