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.* It may also play a role in proper insulin action and glucose metabolism and is critical to immune system function.* Vitamin K is necessary for the formation of healthy, strong bones.* Vitamin K plays a role in arterial health through its ability to support proper calcium metabolism in veins and arteries.* Vitamin K2 is an active and bioavailable form of vitamin K.*