Nature's Plus Cal/ Mag/ Vit D3 with Vitamin K2 is an advanced formulation, employing the most effective & bioavailable bone nutrients available. A potent combination of calcium & magnesium form the basis of skeletal structure. But Nature's Plus Cal/ Mag/ Vit D3 with K2 comes supercharged with 1000 IU of Vitamin D3 & 100 mcg of K2, the most effective form of Vitamin K, for superior absorption & deposition of essential bone minerals.