Vitamin K2 is one of the lesser known forms of vitamin K. It helps move calcium deposits from your arteries, where they can harm your body, to your bones, where your body can use them. In the past, doctors and scientists believed that you don’t need a lot of K2 in your diet, since your body can synthesize vitamin K2 from vitamin K1. However, new research suggests that you need dietary sources of preformed vitamin K2 in order to remain healthy.