Nattokinase Plus is a nutritional supplement designed to support healthy blood flow & circulation. Nattokinase is a fibrinolytic enzyme produced from Natto, a Japanese fermented soy food. The Nattokinase in this formula has high enzyme activity providing 20, 000 fibrin units (FU) per gram & is free of Vitamin K. The Plus in this formula is the inclusion of another fibrinolytic enzyme, Serratiopeptidase with Rutin, a flavonoid that acts as an antioxidant & free radical scavenger to support capillary strength & vascular health.