Vitamin K-2 100 mcg, 250 Veg Capsules, NOW FoodsNOW Foods Vitamin K 2 100 mcg Supports Bone Health. Biologically Active Form. Menaquinone 4 (MK 4). Supports Proper Calcium Metabolism. Although Vitamin K is historically known for its role in normal blood clotting function, we now know that Vitamin K is also essential to bone, cardiovascular, and nervous system health. As a biologically active form of Vitamin K, K 2 is important for the formation of healthy, strong bone matrix. Vitamin K's role in