Ultra Bone-Up® provides StimuCal™ ossein MicroCrystalline HydroxyApatite (MCHA) (from free-range New Zealand calves), which includes the superior combination of the inorganic calcium lattice of MCHA within an organic protein milieu. StimuCal™ is rich in native type I collagen—the predominant protein found in bone—and has been clinically demonstrated not to disproportionately spike calcium blood levels as do other forms of calcium.