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Nattokinase is an enzyme that's been used in traditional Japanese foods for centuries. It's part of a class of enzymes called fibrinolytic enzymes, which are extremely beneficial to the body because they help control our clotting systems. Nattokinase is known best for its ability to effectively reduce elevated blood pressure . By inhibiting an enzyme called angiotensin I-converting enzyme (ACE), which is responsible for blood vessels constricting and increasing blood pressure, any nattokinase supplement may be able to reduce the risk of hypertension and heart attack or stroke.

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