Double Wood Nattokinase 4,000 FU
A clean, measurable fermented-soy enzyme for cardiovascular wellness, healthy circulation, and natural fibrin balance.*
Item #1237 • 120 capsules • 60 servings • 2,000 FU per capsule • 4,000 FU per serving
Order Now Supplement Facts How to Use Safety Research FAQs
Measured enzyme activity · simple daily ritual
Nattokinase is for people who want a smart, specific way to support the heart-and-vessel system every day — without a complicated “mega-stack.”
Double Wood Nattokinase gives you one active enzyme, clearly measured in Fibrin Units (FU), in a convenient capsule form. No strong natto smell. No sticky fermented-soy texture. No guessing about potency.
- 4,000 FU per daily serving — the practical two-capsule serving many people look for in a nattokinase product
- Supports healthy circulation and fibrin balance* by working with the body’s natural fibrinolytic housekeeping system
- Vegan, non-GMO, and gluten-free with third-party testing and Certificate of Analysis availability from Double Wood
“The best supplement story is not hype. It is a clear mechanism, a measured dose, a trusted source, and a habit people can actually keep.”
Order Double Wood Nattokinase ↺➕
120 capsules · 60 servings · 4,000 FU per serving · item #1237
Our Price: $19.95
That is about 33¢ per daily serving for a targeted enzyme with measured FU activity.
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Nattokinase is best thought of as a consistent wellness habit, not a one-time rescue product.
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What Double Wood Nattokinase Is
Nattokinase is an enzyme produced during the fermentation of soybeans into natto, a traditional Japanese food. The word can sound exotic, but the idea is simple: fermentation creates a proteolytic enzyme that has been studied for its relationship to fibrin, the protein mesh involved in normal clot structure and wound repair.
The body already has a fibrinolytic system — a natural cleanup system that helps maintain normal fibrin turnover. Nattokinase is valued because it is a fibrinolytic enzyme, and its activity can be measured in FU, or Fibrin Units. That matters because a label saying “100 mg” does not tell the whole story. With enzymes, activity is the promise.
That is why this product is easy to understand and easy to recommend: 2,000 FU per capsule, 4,000 FU per serving, 120 capsules per bottle, and 60 daily servings. It is specific, measurable, affordable, and simple to repeat.
Why People Choose Nattokinase
The heart-and-vessel system is not maintained by one heroic act. It is maintained by thousands of quiet daily choices: moving, hydrating, eating clean food, managing stress, sleeping well, and giving the body the raw materials it needs. Nattokinase appeals to people who understand that circulation is a daily maintenance issue.
- Healthy circulation support* — a targeted enzyme option for people who want to support normal blood-flow dynamics as part of a broader wellness plan.
- Fibrin balance support* — nattokinase is studied for fibrinolytic activity, meaning its relationship to fibrin turnover is its central reason for use.
- Measurable potency — activity is stated in FU, so the dose is not vague or decorative.
- Easy compliance — two capsules a day is far easier than trying to eat strong-flavored natto consistently.
The Persuasive Difference: A Narrow Promise Is Stronger Than a Wild Promise
Many supplements try to sound important by promising everything. Nattokinase earns attention by being unusually specific. It is not a multivitamin, not a stimulant, not a “proprietary blend,” and not a replacement for medication.
Its honest promise is narrower and therefore more believable: support the body’s natural fibrinolytic balance and healthy circulation as part of daily cardiovascular wellness.*
That clarity is exactly what makes this page persuasive. Customers do not need a miracle story. They need a reason they can understand, a product they can trust, a price they can justify, and a habit they can keep.
Could You Get Nattokinase by Eating Natto?
Yes, in theory. Nattokinase originally comes from natto, the traditional Japanese fermented soybean food.
In practice, many Americans will not eat natto consistently. It has a powerful aroma, sticky texture, and strong taste. Even people who respect natto nutritionally often find it hard to make it a daily habit.
- ❌ Natto flavor and texture are not easy for every palate.
- ❌ Enzyme activity can vary by food preparation and serving size.
- ❌ Natto also naturally contains vitamin K2, which is a concern for people using certain anticoagulant medications.
Double Wood Nattokinase solves the practical problem: it gives a measured enzyme activity in a capsule, making the habit simple and repeatable.
Smarter Daily Option
- ✓ 4,000 FU per serving
- ✓ No natto taste or texture
- ✓ Two capsules daily
- ✓ About 33¢ per serving
- ✓ Third-party tested
The Science Story: Fibrin, Plasmin, and “Circulatory Housekeeping”
1. Fibrin is useful — until balance matters.
Fibrin is part of normal clot structure. The body needs it. But the body also needs a way to remodel and clear fibrin when its job is done. That balancing process is called fibrinolysis.
Nattokinase is studied because it appears to interact with that fibrinolytic side of the equation. This is why it belongs on a heart-and-vessels page, not because it “cures” anything, but because normal flow and normal cleanup are central to cardiovascular wellness.
2. Enzymes should be measured by activity.
For minerals, milligrams can be enough. For enzymes, activity matters. Nattokinase potency is measured in Fibrin Units (FU), which reflects fibrinolytic activity.
Double Wood provides 2,000 FU per 100 mg capsule. The labeled serving is two capsules, giving 200 mg and 4,000 FU.
3. The honest evidence is promising, not magical.
Human studies have examined nattokinase for blood pressure markers, fibrinolysis-related markers, and cardiometabolic outcomes. Some findings are encouraging; other trials are mixed or null.
That is exactly why we position it as daily cardiovascular support* — not as treatment for clots, plaque, hypertension, stroke, or heart disease.
Plain-English positioning: Nattokinase is best presented as a clean, measured enzyme that supports healthy circulation and natural fibrin balance. It is not a substitute for prescribed anticoagulants, antiplatelet therapy, blood-pressure medication, cholesterol medication, emergency care, or medical supervision.
Double Wood Nattokinase — Supplement Facts & How to Use
| Supplement Facts | |
|---|---|
| Serving Size: 2 Capsules | |
| Servings Per Container: 60 | |
| Amount Per Serving | % Daily Value |
| Nattokinase | 200 mg † |
| Providing 4,000 FU (Fibrin Units) per serving | |
| † Daily Value not established. | |
| Other Ingredients: Hypromellose (capsule), rice flour, microcrystalline cellulose, silica. | |
| Contains: Soy. | |
Product facts are based on current Double Wood/Nattokinase listing information. Always compare the page with the physical bottle label when final artwork is supplied.
How to Use
Suggested adult use: Take 2 capsules daily, with or without food, or as directed by your healthcare professional.
Many enzyme users prefer taking nattokinase away from meals, but Double Wood’s current directions allow use with or without food. Consistency matters most: choose a time you can repeat.
Do not exceed the labeled dose unless a qualified healthcare professional specifically directs you to do so.
Storage: Keep the bottle closed and store in a cool, dry place away from excessive heat and moisture. Keep out of reach of children.
Important Safety Notes — Please Read Before Ordering
Nattokinase is not for everyone. Because it has fibrinolytic activity, talk with your physician before use if you take anticoagulant or antiplatelet drugs, including warfarin, Eliquis/apixaban, Xarelto/rivaroxaban, Pradaxa/dabigatran, Savaysa/edoxaban, Plavix/clopidogrel, regular aspirin therapy, heparin, or similar products.
- Do not use if you are allergic to soy.
- Do not use if pregnant, nursing, under 18, or trying to become pregnant unless specifically approved by your clinician.
- Ask your healthcare provider before use if you have a bleeding disorder, a history of hemorrhagic stroke, active ulcer, upcoming surgery, or unusual bruising/bleeding.
- Discontinue before planned surgery as directed by your physician; many nattokinase references advise stopping at least two weeks before surgical procedures.
- Never stop or replace prescribed medication with nattokinase.
Trust-building truth: A responsible nattokinase page should make the safety section easy to find. The right customer will appreciate that honesty.
Why Double Wood Is a Strong Choice
Measured Potency
Each capsule provides 100 mg nattokinase with 2,000 FU activity. The two-capsule serving gives 4,000 FU, making the potency easy to understand.
Clean Daily Value
At $19.95 for 60 servings, the daily cost is roughly one-third of a dollar — a practical price point for a long-term wellness habit.
Quality Signals
Double Wood states that its Nattokinase is vegan, non-GMO, gluten-free, made in a cGMP-certified U.S. facility from globally sourced ingredients, and third-party tested.
Nattokinase Research Snapshot
These references are provided for education and customer research. They are not presented as FDA-approved disease claims.
Blood pressure markers
A randomized, double-blind, placebo-controlled trial in adults with pre-hypertension or stage 1 hypertension used 2,000 FU/day for eight weeks and reported reductions in systolic and diastolic blood pressure versus placebo. Read the study
Fibrinogen and clotting-related markers
A human study using 4,000 FU/day for two months reported decreases in fibrinogen, factor VII, and factor VIII in healthy volunteers, people with cardiovascular risk factors, and dialysis patients. View PubMed
Single-dose fibrinolysis markers
A single-dose oral nattokinase study reported enhancement of fibrinolysis and anticoagulation profiles through multiple measured pathways. Read the full text
Systematic review and meta-analysis
A systematic review and meta-analysis of randomized controlled trials found significant reductions in systolic and diastolic blood pressure compared with placebo, but did not support broad lipid-lowering claims at lower doses; more research is needed. View PubMed
The honest limitation
A longer randomized controlled trial in healthy, low-risk individuals found no effect on subclinical atherosclerosis progression. This is why we do not advertise nattokinase as a plaque-removal or disease-treatment product. Read the abstract
Safety and interaction background
Conservative drug-reference summaries advise caution with anticoagulants, antiplatelet agents, coagulation disorders, pregnancy/lactation, and surgery. Read safety summary
Educational Video
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