The result was shown by 7 healthy people (6 males aged 28-59, 1 female aged 27). Their blood samples were taken before and after taking Nattokinase 4000FU and measured their platelet aggregation. Collagen and ADP were used for aggregation attractants. As a result, platelet aggregation inhibition peaked 6 hours after taking Nattokinase among most people, which indicates a strong inhibition of platelet aggregation.