Nattokinase is a fibrinolytic enzyme derived from natto, a fermented soybean food. It is used as a supplement for cardiovascular support, especially related to fibrin breakdown.

What are the potential benefits of nattokinase?

It may support healthy fibrinolysis and has been studied for modest effects on blood pressure and lipid markers. Evidence for neuroprotective effects is preliminary and not established in humans.

What is a typical nattokinase dose?

Supplement doses are commonly listed in fibrinolytic units (FU). A typical range is about 2000–7000 FU per day, but individual needs and product potency vary.

Who should avoid nattokinase or use it cautiously?

People with bleeding disorders, those scheduled for surgery, or anyone taking anticoagulants or antiplatelet drugs should use caution due to bleeding risk. Pregnancy and breastfeeding safety is not well established, so medical guidance is recommended.

Does nattokinase interact with blood thinners?

Yes, it may increase bleeding risk when combined with anticoagulants or antiplatelet medications. Consult a clinician before combining it with these drugs or if you have a history of bleeding.

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Nattokinase

Moderate study situation·7/10

A higher score indicates better study conditions, but not necessarily effectiveness.

Nattokinase is a fibrinolytic enzyme derived from natto linked to cardiovascular benefits, but must be used cautiously due to bleeding risk.

Cardiovascular Support Neuroprotective Cholesterol Management

dose range

2000–7000 FU

1–2 doses daily

Consumption

Take on an empty stomach with water for enhanced absorption.

Not fat-soluble.

Best time

Most commonly taken in the morning or before bed, away from meals. Adhere strictly to label and clinical guidelines.

Description

Nattokinase is an enzyme extracted from the Japanese fermented soybean food natto. It is noted for its ability to degrade fibrin and has been researched for cardiovascular support, especially blood clot reduction and blood pressure management.

benefits

Main effects with level of evidence

Moderate

Note on evidence

There is moderate clinical evidence for nattokinase's effects on clot breakdown and mild blood pressure reduction; other claimed effects need more research.

Supports healthy blood clot dissolution (fibrinolysis)

Moderate

Nattokinase has been shown to enhance the body's ability to break down fibrin, aiding in the prevention and dissolution of blood clots, which may lower the risk of thrombosis.

Particularly relevant for: Adults seeking cardiovascular health support

S1 · PubMed Review (2018): Cardiovascular effects of nattokinase S4 · Examine.com: Nattokinase Evidence Summary

May modestly reduce blood pressure

Moderate

Clinical studies have reported a small reduction in both systolic and diastolic blood pressure in hypertensive adults taking nattokinase daily.

Particularly relevant for: Adults with mildly elevated blood pressure

S1 · PubMed Review (2018): Cardiovascular effects of nattokinase S4 · Examine.com: Nattokinase Evidence Summary

May improve lipid profile

Limited

Some data suggest nattokinase can moderately reduce total cholesterol, LDL, and triglycerides, while raising HDL, especially in people with high cholesterol.

Particularly relevant for: Adults with dyslipidemia

S1 · PubMed Review (2018): Cardiovascular effects of nattokinase

Potential neuroprotective effects

Theoretical

Preliminary studies show nattokinase may degrade amyloid fibrils, but there is insufficient evidence for a clear neuroprotective benefit in humans.

Particularly relevant for: Researchers, those interested in cognitive health

S1 · PubMed Review (2018): Cardiovascular effects of nattokinase

Safety & Information

Important safety information & known risks

For educational purposes only • not medical advice

Potential for increased bleeding is the most important safety concern with nattokinase, especially with anticoagulant or antiplatelet medications.

warning notices

May increase risk of bleeding, particularly in those using blood thinners or with bleeding disorders.
Insufficient safety data for pregnancy, breastfeeding, and children.
Rare allergic or gastrointestinal reactions are possible.
Avoid if you have an active bleeding disorder or history of hemorrhagic stroke.
Discontinue use at least two weeks prior to surgery to reduce bleeding risk.
Use only under medical supervision if taking anticoagulants or antiplatelet medications due to increased bleeding risk.
Avoid use if pregnant, breastfeeding, or in children due to insufficient safety data.

Known interactions with medications

Anticoagulants (warfarin, heparin)
Antiplatelet agents (aspirin, clopidogrel)

Contraindications / special precautions

Active bleeding disorder
Hemorrhagic stroke history
Concurrent anticoagulant/antiplatelet use without supervision
Pregnancy/breastfeeding
Children

interactions

Important interactions between active ingredient ↔ supplement / medication / food

Nattokinase has significant interactions with medications and supplements affecting clotting.

Increased risk of bleeding with anticoagulant drugs.

drug · Anticoagulants (e.g., warfarin, heparin)

AvoidModerate

Why

Nattokinase's fibrinolytic effect can increase bleeding risk when combined with blood thinners.

recommendation

Do not combine nattokinase with anticoagulant medications without direct medical oversight.

S2 · WebMD: Nattokinase S3 · Drugs.com: Nattokinase Monograph

Concurrent use may increase bleeding risk.

drug · Antiplatelet drugs (e.g., aspirin, clopidogrel)

AvoidModerate

Why

Combination enhances blood thinning effect, raising bleeding and bruising potential.

recommendation

Avoid combination or only use under clinical supervision.

S2 · WebMD: Nattokinase S3 · Drugs.com: Nattokinase Monograph

mechanisms of action

Brief explanations of how it works

Fibrinolytic activity

Breaks down fibrin, a key protein in blood clot formation, leading to enhanced clot dissolution and reduced thrombus risk.

S1 · PubMed Review (2018): Cardiovascular effects of nattokinase

Mild antihypertensive effect

Possible vasodilatory effects and blood viscosity reduction may support a small drop in blood pressure.

S1 · PubMed Review (2018): Cardiovascular effects of nattokinase S4 · Examine.com: Nattokinase Evidence Summary

Modulation of lipid metabolism

Limited evidence suggests nattokinase may improve cholesterol transport and reduce triglyceride formation.

S1 · PubMed Review (2018): Cardiovascular effects of nattokinase

Amyloid fibril degradation (preclinical)

Laboratory data hint at the ability to degrade amyloid proteins, posited as potentially beneficial in neurodegenerative disease models.

S1 · PubMed Review (2018): Cardiovascular effects of nattokinase

Sources & References

Primary literature and reviews on which these statements are based

7 sources

PubMed Review (2018): Cardiovascular effects of nattokinase

WebMD: Nattokinase

Drugs.com: Nattokinase Monograph

Examine.com: Nattokinase Evidence Summary

WorldNutrition: How to Take Nattokinase

Supplement timing and dosing tips.

FineUSA Trading: Optimal Timing for Nattokinase

Timing recommendations.

NIH Office of Dietary Supplements: Antithrombotic agents fact sheet

Last updated: March 13, 2026

This information is for educational purposes only and does not replace medical advice.