Nattokinase is an enzyme isolated from Natto, a traditional Japanese fermented soy food.&ampnbsp; Natto has been consumed safely for thousands of years for its numerous health benefits.&ampnbsp; More recently, both clinical and non-clinical studies have demonstrated that Nattokinase supports heart health and promotes healthy circulation.&ampnbsp; Each serving of NOW&ampreg; Nattokinase provides 2000 FU (Fibrinolytic Units) to help keep already healthy levels of blood clotting factors within a normal range.*