Nattokinase 4000 FU Circulation & Heart Health Support

The clinically studied enzyme for healthy circulation.

Nattokinase is an enzyme derived from natto a traditional Japanese fermented soybean food that's been a dietary staple in Japan for over 1,000 years. Modern research has focused on nattokinase's role in supporting healthy blood flow, circulation, and cardiovascular function.

The research on nattokinase points to one specific dose that shows up again and again in clinical studies: 4,000 FU per day. That's exactly what our formula delivers.

Hazel's Choice Nattokinase 4000 FU gives you the full clinically studied dose in a clean, non-GMO capsule — no fillers, no shortcuts, no compromises.

Why nattokinase and why 4000 FU

●       Supports healthy blood flow — nattokinase is best known for its role in maintaining healthy circulation

●       Cardiovascular wellness — supports the systems that keep your heart and vessels working smoothly

●       Clinically studied dose — 4,000 FU is the amount most consistently used in human research

●       Traditional food origin — derived from natto, safely consumed for over a millennium in Japan

●       Enzyme activity, not just weight — FU (fibrinolytic units) measures the enzyme's actual activity, which is what matters clinically

Who this is for

●       Adults focused on long-term cardiovascular wellness

●       People who sit for long periods (frequent travelers, desk workers)

●       Anyone interested in traditional Japanese functional foods without eating natto

●       Adults over 40 looking to support healthy circulation as they age

●       People building a comprehensive heart health routine (with omega-3s, CoQ10, etc.)

What's inside — and what's not

In every capsule:

●       200 mg Nattokinase (4,000 FU enzyme activity)

●       Vegetable capsule shell

What's not:

No fillers, artificial preservatives, colors, gluten, or GMO ingredients.

How to take it

Take 1 capsule per day, preferably with a meal. For higher-dose protocols under practitioner guidance, dosing may be adjusted.

Important: If you take blood-thinning medications (warfarin, aspirin, clopidogrel), have a bleeding disorder, or are scheduled for surgery, talk to your healthcare provider before starting nattokinase.

Quality you can verify

●       Full 4,000 FU per capsule — the clinically studied dose

●       Standardized enzyme activity, measured in fibrinolytic units (FU)

●       Made in GMP-certified facilities

●       Third-party tested for purity and activity

●       Non-GMO, gluten-free, no fillers

●       120 capsules per bottle — a 4-month supply at 1 per day

Frequently Asked Questions

What does nattokinase do?

Nattokinase is a fermented soybean-derived enzyme most studied for its role in supporting healthy circulation and cardiovascular wellness. It's been used in Japan as part of the traditional diet for over a thousand years.

Is 4000 FU a good dose?

Yes — 4,000 FU is the dose most consistently used in human research on nattokinase. Some brands sell lower doses (1,500–2,000 FU); ours delivers the full clinically studied amount in a single capsule.

How long does nattokinase take to work?

Research protocols typically run 4–8 weeks or longer. Effects on circulation and cardiovascular markers build gradually with consistent use, not overnight.

Can I take nattokinase with blood pressure medication?

Talk to your healthcare provider first. Nattokinase can interact with blood-thinning medications and may affect blood pressure. Personalized medical guidance is essential.

Is nattokinase safe for daily use?

For healthy adults not on blood-thinning medication, nattokinase has a strong safety profile in research. Always check with a healthcare provider if you're on medication, have a bleeding disorder, or are scheduled for surgery.

Does nattokinase come from soy? Is it allergen-friendly?

Nattokinase is derived from fermented soybeans (natto). If you have a soy allergy, this may not be suitable for you — check with your healthcare provider.

When should I take nattokinase?

With a meal is generally recommended for best tolerance. Consistency matters more than time of day.