You may have noticed that some Vitamin D supplements in the OTC aisle are now coming complete with another substance known as Vitamin K2. So what does Vitamin K have to do with Vitamin D? In this video we discuss the following frequently asked questions: What does vitamin K do and what is it’s role in the body? What are the signs of a vitamin K deficiency? What are the best dietary sources of vitamin K? Can vitamin K supplements interact with medications?