Source of Life Garden Organic Bone Support Caps with Organic Gold Standard Nutrients is the breakthrough all-organic source of whole-plant-source calcium and magnesium, plus vitamin D3 (cholecalciferol) and vitamin K2. Source of Life Garden Bone Support nutritionally supports healthy bones with 1000 mg of the most assimilable plant-based calcium from AlgaeCal. This marine algae is carefully, and sustainably, harvested live from the pristine shores of protected coastline in South America. For maximum absorption and utilization, Garden Bone Support provides 1000 IU of vitamin D3. Its vitamin K2 (menaquinone-7) is the most bioavailable form of vitamin K, the critical bone-health nutrient.