Nattovena - 180 Capsules (REPLACES Nattovita &Nattokinase)Nattokinase is a fibrinolytic (fibrin dissolving) enzyme discovered in a Japanese fermented soybean called natto. With more than 4,000 fibrinolytic units (FUs) per capsule, Nattovena is a potent nattokinase supplement with double the fibrin degrading ability compared to similar products. Fibrin levels fluctuate as we age, and too much fibrin in the blood can lead to many health concerns such as fatigue, painful joints & unhealthy circulation.