There is more than one vitamin K. Each one is structurally similar, fat-soluble, and is vital for calcium balance, bone strength and cardiovascular health.
Vitamin K has been found to help maintain bone mineral density. In addition, vitamin K2 is a potent vitamin in its ability to block the progression of arterial thickening and stiffening. Vitamin D and vitamin K act synergistically, by elevating and activating enzymes that promote a healthy heart and strong bones. For instance, vitamin D and vitamin K provide cardiovascular protection by elevating and activating Matrix GLA Protein (MGP), an inhibitor of circulatory calcification, respectively. Thus, both vitamin D3 and K2 are necessary for a healthy heart and strong bones.