What is Nattokinase and where does it come from?

Nattokinase is a serine protease enzyme produced by *Bacillus subtilis* during the fermentation of soybeans into natto, a traditional Japanese food. It is renowned for its potent fibrinolytic (clot-dissolving) activity and is the primary bioactive compound responsible for natto's health benefits.

How does Nattokinase benefit cardiovascular health?

Nattokinase supports cardiovascular health primarily by directly hydrolyzing fibrin, a key protein in blood clot formation, which helps improve blood flow. It also promotes vascular elasticity, contributes to healthy blood pressure regulation, and exhibits anti-thrombotic effects by enhancing the body's natural clot-dissolving mechanisms.

What specific mechanisms does Nattokinase use to dissolve clots?

Beyond direct fibrin hydrolysis, Nattokinase enhances thrombolytic activity by cleaving plasmin substrate and activating pro-urokinase to urokinase. It also increases tissue plasminogen activator (t-PA) and degrades plasminogen activator inhibitor-1 (PAI-1), all contributing to a more efficient breakdown of blood clots.

Are there any known side effects or interactions with Nattokinase?

While generally safe, nattokinase can increase the risk of bleeding, especially when combined with anticoagulant or antiplatelet medications. Common side effects are rare but could include gastrointestinal upset. It is contraindicated for individuals with bleeding disorders or those undergoing surgery.

Who should avoid taking Nattokinase?

Individuals with bleeding disorders, those currently taking blood-thinning medications (anticoagulants or antiplatelets), or persons scheduled for surgery should avoid nattokinase due to increased bleeding risk. Pregnant or breastfeeding women should also refrain from using it due to a lack of sufficient safety data.

What is the recommended dosage of Nattokinase, and when should I take it?

Most clinical studies use Nattokinase doses ranging from 100 to 2,000 FU (fibrinolytic units) daily, with 100–200 FU being common for maintenance and prevention. It is typically recommended to take Nattokinase on an empty stomach, either in the morning or evening, to maximize absorption and enzyme activity. Consistency is more important than timing, so choose a time you can maintain daily; however, avoid taking it immediately before or after meals high in fat, which may reduce bioavailability.

Does Nattokinase interact with blood thinners and antiplatelet medications like warfarin or aspirin?

Nattokinase has anti-thrombotic properties and may have an additive effect when combined with anticoagulants (warfarin, dabigatran) or antiplatelet drugs (aspirin, clopidogrel), potentially increasing bleeding risk. Medical supervision is essential if you are taking prescription blood thinners, as your healthcare provider may need to monitor INR levels or adjust dosages. It is generally safer to use Nattokinase as a preventive measure in those not yet on medication, or under direct medical guidance if concurrent use is necessary.

What does clinical research show about Nattokinase's effectiveness compared to other fibrinolytic supplements?

Nattokinase has been studied more extensively than many competing fibrinolytic enzymes, with multiple randomized controlled trials demonstrating dose-dependent improvements in blood viscosity, fibrin degradation, and blood flow parameters. While research quality is moderate to strong, most studies are conducted in Asian populations, and larger, longer-duration trials in diverse populations are still needed to fully establish superiority over other enzyme supplements like Lumbrokinase or Serrapeptase. The enzyme's direct fibrinolytic activity (measured in FU units) is one of the most well-characterized among proteolytic supplements, making dosing and comparisons more standardized.

Is vitamin K2 the same as nattokinase?

No, vitamin K2 (menaquinone) and nattokinase are entirely different compounds found in natto, though both originate from the same fermented soybean food. Nattokinase is a serine protease enzyme with fibrinolytic activity that dissolves blood clots, while vitamin K2 is a fat-soluble vitamin involved in calcium metabolism and bone health. Importantly, nattokinase supplements are often processed to remove vitamin K2, making them safer for individuals on warfarin or other anticoagulants who must avoid vitamin K.

Can nattokinase be taken with blood thinners like warfarin or aspirin?

Nattokinase should be used with caution alongside anticoagulant or antiplatelet medications such as warfarin, heparin, or aspirin, as its fibrinolytic and anti-platelet effects may potentiate bleeding risk. The combination can amplify thrombolytic activity beyond therapeutic targets, potentially leading to excessive bleeding. Individuals on prescription blood thinners should consult a healthcare provider before supplementing with nattokinase, and regular monitoring of coagulation markers such as INR is advisable.

How long does it take for nattokinase to show effects on blood pressure or cardiovascular markers?

Human clinical trials suggest that meaningful reductions in blood pressure and improvements in fibrinolytic markers can be observed after approximately 8 to 12 weeks of consistent daily supplementation. One randomized controlled trial demonstrated significant reductions in both systolic and diastolic blood pressure after 8 weeks at doses around 2,000 FU (fibrinolytic units) per day. Individual responses may vary based on baseline cardiovascular health, diet, and lifestyle factors.

Does cooking or heating destroy nattokinase activity?

Yes, nattokinase is a heat-sensitive enzyme and its fibrinolytic activity is significantly reduced or destroyed when natto is cooked at high temperatures. Studies indicate that nattokinase retains its activity when natto is consumed at room temperature or after mild warming but loses potency above approximately 50–60°C (122–140°F). This is a key reason why encapsulated nattokinase supplements—manufactured under controlled low-temperature conditions—are preferred for delivering consistent, measurable enzymatic activity.

Nattokinase from Natto

Nattokinase is a potent serine protease enzyme derived from *Bacillus subtilis natto* during the fermentation of soybeans, primarily recognized for its strong fibrinolytic (clot-dissolving) activity. It directly hydrolyzes fibrin, a key component of blood clots, and enhances the body's natural thrombolytic processes to improve cardiovascular health.

Category: Other Evidence: 4/10 Tier: Emerging

Nattokinase from Natto — Hermetica Encyclopedia

Origin & History

Nattokinase is a potent serine proteolytic enzyme (EC 3.4.21.x) derived from *Bacillus subtilis natto*, the bacterium responsible for fermenting soybeans into the traditional Japanese food, natto. Renowned for its significant fibrinolytic activity, nattokinase supports healthy blood circulation and reduces the risk of blood clot formation. It is widely utilized in supplements for its natural therapeutic properties in cardiovascular health.

Historical & Cultural Context

Nattokinase's origins are deeply rooted in Japanese traditional dietary practices, stemming from the consumption of natto, a fermented soybean dish, for over a thousand years. Valued for its perceived health benefits, particularly for circulation, the enzyme itself was isolated and identified in 1987 by Dr. Hiroyuki Sumi, leading to modern scientific validation of its potent cardiovascular properties.

Health Benefits

- Supports cardiovascular health by directly hydrolyzing fibrin, a key protein in blood clot formation, thereby improving blood flow.
- Contributes to healthy blood pressure regulation by promoting vascular elasticity and reducing blood viscosity.
- Exhibits anti-thrombotic effects, reducing the risk of deep vein thrombosis (DVT) and other clot-related cardiovascular events.
- Modulates inflammatory responses within the vascular system, supporting overall endothelial health.
- Enhances systemic circulation, facilitating improved oxygen and nutrient delivery to tissues throughout the body.

How It Works

Nattokinase (NK) primarily acts by directly hydrolyzing fibrin, the main protein component of blood clots. Additionally, it enhances the body's intrinsic fibrinolytic system by cleaving plasmin substrate, activating pro-urokinase to urokinase, increasing tissue plasminogen activator (t-PA), and degrading plasminogen activator inhibitor-1 (PAI-1). These combined actions significantly enhance overall thrombolytic activity, promoting better blood flow.

Scientific Research

Extensive in vitro, animal, and human clinical trials, including randomized controlled studies, have investigated nattokinase's fibrinolytic, anti-hypertensive, and anti-platelet aggregation effects. Research supports its potential in reducing blood clot formation, improving blood flow, and contributing to healthy blood pressure levels, establishing its role in cardiovascular health.

Clinical Summary

Extensive research, including in vitro, animal, and human clinical trials—some being randomized controlled studies—has investigated nattokinase's effects. These studies have consistently demonstrated its fibrinolytic, anti-hypertensive, and anti-platelet aggregation properties. Outcomes suggest nattokinase's potential in reducing blood clot formation, improving blood flow, and contributing to healthy blood pressure regulation, supporting its role in cardiovascular health.

Nutritional Profile

- Serine proteolytic enzyme (EC 3.4.21.x)
- Specific activity: Fibrinolytic (hydrolyzes fibrin, fibrinogen, and plasminogen activator inhibitor-1)
- Units of activity: Fibrinolytic Units (FU)

Preparation & Dosage

- Common forms: Primarily available in enteric-coated capsules or tablets to ensure enzyme activity in the small intestine.
- Dosage: Typically ranges from 100–200 mg daily, providing 2,000–4,000 Fibrinolytic Units (FU).
- Timing: Best taken on an empty stomach, at least 30 minutes before or 2 hours after a meal, for optimal systemic absorption.
- Contraindications: Individuals on anticoagulant medications (e.g., warfarin, heparin) or with bleeding disorders should consult a healthcare professional due to its blood-thinning effects.

Synergy & Pairings

Role: Enzymatic cofactor
Intention: Cardio & Circulation | Longevity & Anti-Aging
Primary Pairings: - Lumbrokinase (Lumbricus rubellus)
- Coenzyme Q10 (CoQ10)
- Magnesium (various forms)
- Hawthorn Berry (Crataegus monogyna)

Safety & Interactions

Nattokinase is generally considered safe; however, due to its potent anti-thrombotic and fibrinolytic effects, it should be used with caution, particularly by individuals on anticoagulant medications (e.g., warfarin) or antiplatelet drugs (e.g., aspirin), as it may increase the risk of bleeding. It is contraindicated in individuals with bleeding disorders, those undergoing surgery, or recent stroke. Pregnant or breastfeeding women should avoid nattokinase due to insufficient safety data.