Nattokinase is one of many different enzymes isolated from the fermented food product known as Natt? (fermented, boiled soybeans). Nattokinase has become popular as a supplement in recent years due to its fibrinolytic properties allowing it to degrade fibrin.Nattokinase varies in potency from 1000 Fu / 100 mg to 2000 Fu / 100 mg, Fu stands for fibrin units which as an activity unit quantifying the ability of a given Nattokinase supplement to degrade fibrin. Our Nattokinase supplement is highly potent at 2000 Fu / 100 mg.