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D3 5,000 + K is has 5,000 IU of vitamin D3 in this formulation variation of our popular D3 10,000 + K. New research is focusing on bone andcardiocascular health benefits from the synergistic relationship between vitamin K2 and vitamin D3. Vitmamin K is a groupr of structurally similar, naturally occurring fat-soluble vitamins essential to proper calcium utilization. Vitamin K activates the protein osteocalcin to help bind recently absorbed calcium to the the bone's mineral matrix. Vitamin K has been found to help maintain bone mineral density by decreasing the activity of cells that breaks down the bone matrix. While vitamin D and vitamin k share similar qualities, they also act synergistically to supports healthy blood circulation, boosts immune function, and promote bone health and proper storage of calcium.