Our unique formula combines Cal/Mag with two powerful calcium boosters: Vitamins D-3 and K-2. • Vitamin D is essential to maximize absorption of calcium. Our Vitamin D is in the D-3 form, the most biologically active* • Vitamin K-2 has been found to promote the synthesis of proteins involved with calcium utilization, helping to keep calcium out of arterial walls and in the muscles and bones where it belongs* Cal/Mag Plus provides a complete supplement that delivers maximum calcium and helps support heart health.*