Vitamin D controls the absorption of calcium entering into the blood. Vitamin K2 controls where that calcium ends up. Our Vitamin K with D3 is formulated for maximum benefit plus it contains calcium and BioPerine which aides in effective absorption. The use of Vitamin K with D3 supports blood glucose control, calcium absorption/bone health, cardiac health, protects against oxidative stress and provides anti-inflammatory properties. Vitamin K plays a role in clotting so if you are on a blood thinner, consult your physician before using this product.