For many years, conversations about heart health focused on cholesterol alone.
But scientists now understand that circulation, blood flow, inflammation, and vascular flexibility all play important roles in long-term cardiovascular wellness.
One natural compound that has attracted growing scientific interest is nattokinase, an enzyme derived from a traditional Japanese food called natto.
Although natto has been eaten in Japan for centuries, nattokinase has only recently begun attracting attention from researchers studying circulation and vascular health.
So what exactly is nattokinase, and why are scientists studying it?
Let’s take a closer look.
Quick Answer: What Is Nattokinase?
Nattokinase is a natural enzyme produced during the fermentation of soybeans by the bacterium Bacillus subtilis.
This fermentation process creates natto, a traditional Japanese food known for its distinctive texture and strong flavor.
During fermentation, the bacteria produce the enzyme nattokinase, which has attracted scientific interest because of its fibrinolytic activity, meaning its ability to break down fibrin.
Fibrin is a protein involved in blood clotting.
In healthy conditions, the body naturally balances fibrin formation and fibrin breakdown. However, excessive fibrin accumulation may contribute to thicker blood consistency and reduced circulation.
Researchers have explored whether nattokinase may help support the body’s natural fibrin regulation processes.
A Traditional Food with Modern Scientific Interest
Natto has been part of Japanese cuisine for over 1,000 years.
It is especially popular in eastern regions of Japan and is commonly eaten for breakfast with rice.
Interest in natto grew when researchers began examining dietary patterns in regions of Japan associated with exceptional longevity. Some scientists noticed that fermented foods, including natto, were regularly consumed.
In the 1980s, Japanese researcher Dr. Hiroyuki Sumi identified the enzyme responsible for natto’s fibrin-breaking properties and named it nattokinase.
Since then, scientists have investigated its potential role in supporting circulation and vascular health.
Why Circulation Matters More Than Many People Realize
Your circulatory system delivers oxygen and nutrients to every organ in your body.
Healthy blood flow supports:
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Heart function
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Brain health
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Energy levels
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Skin health
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Exercise recovery
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Metabolic balance
As people age, arteries naturally become less flexible and blood flow efficiency can decline.
This process may be influenced by:
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inflammation
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oxidative stress
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lifestyle habits
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metabolic health
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vascular stiffness
Maintaining healthy circulation is therefore an important part of healthy aging.
What Is Fibrin and Why Do Scientists Study It?
To understand nattokinase, it helps to understand fibrin.
Fibrin is a protein involved in the body’s clotting process.
When an injury occurs, fibrin forms a mesh that helps stop bleeding and stabilize clots. This is a vital and protective mechanism.
However, excessive fibrin accumulation inside blood vessels may contribute to thicker blood consistency and reduced circulation efficiency.
The body naturally produces enzymes that break down fibrin, a process known as fibrinolysis.
Researchers became interested in nattokinase because laboratory studies suggested it may support this natural fibrin breakdown process.
How Nattokinase Works in the Body
Research suggests nattokinase may influence circulation through several mechanisms.
These include:
Supporting Fibrin Breakdown
Nattokinase has demonstrated fibrinolytic activity in laboratory studies, meaning it can break down fibrin protein.
Supporting Healthy Blood Flow
By supporting fibrinolytic balance, nattokinase may help maintain healthy circulation.
Supporting Vascular Flexibility
Some studies have explored whether nattokinase may support healthy blood pressure levels by promoting vascular relaxation.
It is important to note that research is ongoing and scientists continue to study how these mechanisms work in humans.
What Research Says About Nattokinase
Several studies have explored nattokinase’s effects on cardiovascular markers.
For example, a randomized controlled trial published in Hypertension Research examined the effects of nattokinase supplementation in adults with elevated blood pressure.
Participants taking nattokinase showed improvements in systolic and diastolic blood pressure compared with placebo.
Study reference:
Kim JY et al. Effects of nattokinase on blood pressure.
https://pubmed.ncbi.nlm.nih.gov/18971533/
Other studies have investigated its fibrinolytic activity and effects on circulation markers.
While more large-scale research is needed, the results have been promising enough to continue scientific interest in this enzyme.
Why Nattokinase Is Often Used for Circulation Support
People interested in proactive cardiovascular wellness sometimes explore nattokinase for its potential to support:
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healthy circulation
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normal blood viscosity
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vascular flexibility
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heart health routines
It is often used alongside other lifestyle strategies such as:
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regular physical activity
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anti-inflammatory nutrition
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stress management
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healthy sleep habits
These factors together support long-term vascular health.
Why Quality Matters with Nattokinase Supplements
Not all nattokinase supplements are the same.
Quality products typically measure nattokinase activity in Fibrinolytic Units (FU), which indicate enzyme potency.
Higher potency formulations and well-sourced ingredients may provide more consistent activity.
Crane Wellness Nattokinase Blend contains 6,000 FU of nattokinase, along with additional ingredients traditionally associated with cardiovascular wellness, including:
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Okinawa moromi vinegar
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Aomori garlic extract
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GABA
This formulation reflects the brand’s commitment to combining traditional Japanese wellness ingredients with modern research.
Final Thoughts
Nattokinase is a fascinating example of how traditional foods can inspire modern scientific exploration.
Derived from fermented soybeans, this enzyme has attracted attention for its potential role in supporting circulation and cardiovascular wellness.
While research continues, its long history in Japanese dietary traditions and growing scientific interest make it one of the most intriguing natural compounds in cardiovascular research.
For individuals interested in proactive heart health, understanding how circulation works and how ingredients like nattokinase may support it can be a valuable step toward long-term wellness.
