NOW combines two nutrients extensively researched for their contribution to the health of bones, teeth and the cardiovascular system.* Vitamin D3 promotes Calcium transport and absorption.* Recent studies indicate that Vitamin D3 may play a role in proper insulin action and glucose metabolism and has an important function within the immune system.* Vitamin K is critical for the formation of a healthy, strong bone matrix.* Vitamin K's role in arterial health revolves around its ability to support proper Calcium metabolism in vascular structures.* Vitamin K2 is a readily active and biologically available form of Vitamin K.