Natto-K™ contains specialized blends of enzymes including Nattokinase with NSK-SD®—the only form of nattokinase that does not contain vitamin K2—to enhance the body’s production of plasmin.* Plasmin breaks down excess fibrin, which may improve circulation.* Natto-K helps maintain normal levels of blood clotting factors within a healthy range,* and promotes optimal circulation and cardiovascular health.*