Helps Maintain Normal Blood Flow* 2,000 FUs of Activity 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 to 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. Natural color variation may occur in this product.