Mechanisms of Nattokinase in Protection of Cerebral Ischemia

This mechanistic study explored multiple pathways by which nattokinase might protect the brain during ischemia (reduced blood flow), beyond simple clot dissolution.

In animal and cell experiments, nattokinase raised platelet cAMP, activated JAK1/STAT1 signaling, blunted thrombin-induced calcium rises, enhanced nitric-oxide-mediated vessel relaxation, and altered endothelial secretion of clotting regulators. The authors framed it as a multi-pronged neuroprotective profile — antiplatelet, antioxidant, vasodilatory, and pro-fibrinolytic.

This is preclinical mechanism-hunting. A long list of plausible pathways in animal models does not establish that an oral supplement protects human brains, and the catalog of mechanisms outruns any demonstrated clinical effect.

We rate the evidence limited. It is exploratory animal research adding to nattokinase’s speculative mechanistic literature, with no clinical demonstration of benefit and the same unaddressed bleeding-safety questions that shadow the enzyme.