NOW Mega D-3 & MK-7 combines vitamins D-3 and K-2, two nutrients extensively researched for their roles in the health of bones, teeth and the cardiovascular system. Vitamin D-3 works with calcium to support bone health, and more recent studies indicate it’s important for immune system health as well. MenaQ7 MK-7 is a unique soy-free, bioavailable form of vitamin K-2 that plays a critical role in arterial health through its ability to support proper calcium metabolism in blood vessels and arteries. Vitamin K-2 is also important for the formation of strong, healthy bones.