Science-Based Nutrition Microcrystalline Hydroxyapatite Calcium Bone Health Maintenance Dietary Supplement Non-GMO - Gluten Free - Soy Free Doctor's Best Calcium Bone Maker Complex with MCH-Cal supplies key bone nutrients in their most bioactive forms. MCH-Cal supplies natural Calcium and Type I Collagen, the predominant protein found in bone. Vitamin C assists bone matrix formation. Vitamin D3 and K2 help support the absorption of calcium into bone and help protect blood vessels from arterial calcification. MCH-Cal has been clinically demonstrated not disproportionately spike calcium blood serum levels. Broad nutrient spectrum for healthy bone replace Optimized to ensure safe and effective calcium utilization Contains high absorption ingredients Helps promote skeletal, muscular, overall health and well-being