Cardiovascular Health Helps Maintain Normal Blood Flow 2,000 FUs of Activity A Dietary Supplement Vegetarian - Vegan General Health Family Owned Since 1968 GMP Quality Assured Nattokinase is an enzyme isolated from Natto, a traditional Japanese fermented soy food. Natto has been consumed for thousands of years for its numerous health promoting properties. More recently, both clinical and non-clinical studies have demonstrated that Nattokinase can help promote heart and circulatory health by supporting normal blood clotting functions. NOW Nattokinase is derived from non-GMO soy and has 2,000 FUs (Fibrinolytic Units) per 100 mg serving.