NSK-SD (Nattokinase) 100 mgPromotes healthy fibrinolytic activity for healthy blood flow and cardiovascular function; standardized to contain a minimum of 20,000 FU (fibrinolytic units) per gram.* Nattokinase, a fibrinolytic enyzme isolated from Japanese natto, helps to maintain the healthy activity of the bodys natural clotting and fibrinolytic processes. In an animal study conducted by Biotechnology Research Laboratories and JCR Pharmaceuticals of Kobe, Japan, nattokinase