A growing body of research shows that when it comes to bone health, ensuring optimal intake of vitamin K is a critical piece of the puzzle. New research is focusing on the synergistic relationship between vitamin K (specifically, vitamin K2) and vitamin D3, especially in terms of bone strength and cardiovascular health. A group of naturally occurring and structurally similar, fat-soluble vitamins, vitamin K is essential for the proper utilization of calcium. Through its activation of the protein osteocalcin, vitamin K helps to bind newly absorbed calcium to the mineral matrix in bone. In addition, vitamin K has been found to help maintain bone mineral density by decreasing the activity of osteoclasts, a cell that breaks down the bone matrix. Therefore, vitamin K and vitamin D not only share similar qualities, but they also act in synergy within the body. The addition of MenaQ7® PRO to this formula is backed by extensive research. Dr. Leon Schurgers, world-renowned expert in vitamin K2 as MK-7 research for cardiovascular and bone health, and his team of research scientists have conducted over 15 clinical trials on MenaQ7® PRO through the University of Maastricht. Liquid Vitamin D3 with K2 includes 10 mcg of MenaQ7® PRO, the most widely studied form of vitamin K2 as MK-7, and 1,000 IU of vitamin D3 per serving. The tasteless liquid formula can easily be combined with any beverage. Suggested Use: 1 or more drops per day (can be taken directly on the tongue or mixed with the beverage of your choice) or as recommended by your health care professional