by Joseph Mercola Recently by Joseph Mercola: Extreme Endurance Cardio May Do More Harm ThanGood Story at-a-glance Vitamin K2 is an important fat-soluble vitamin that plays critical roles in protecting your heart and brain, and building strong bones. It also plays an important role in cancer protection The biological role of vitamin K2 is to … Continue reading What You Need To Know About Vitamin K2, D, and Calcium