Your Brain Needs a Lot More Blood Than You Might Think
When someone mentions healthy circulation, what organ immediately comes to mind?
Probably your heart.
And for good reason. Your heart and blood vessels work around the clock to move blood throughout your body.
But there's another organ with an extraordinary dependence on that circulation:
Your brain.
Although the adult brain accounts for only about 2% of total body weight, it receives approximately 15% of cardiac output and consumes about 20% of the body's oxygen at rest.
That's a lot of resources for a relatively small organ. And it makes sense when you consider everything your brain is doing at any given moment.
Thinking.
Remembering.
Moving.
Speaking.
Processing what you see and hear.
Regulating countless functions you don't even consciously think about.
All of that activity requires energy and a healthy vascular system helps continuously deliver the oxygen and nutrients brain tissue needs. So perhaps we need to expand the way we think about circulation.
Healthy circulation isn't only a heart-health conversation.
It's a whole-body wellness conversation, and your brain is very much part of it.
🧠 One Minute Wellness
If you remember just one thing from this article, make it this:
What's good for your cardiovascular system is often important for your brain, too.
Your brain depends on an extensive network of blood vessels to continuously deliver oxygen and nutrients. That's one reason researchers increasingly view vascular health as an important component of maintaining cognitive wellness throughout life.
Your Brain Has Its Own Highway System
Imagine your circulatory system as an enormous transportation network.
Your heart is the pump that keeps traffic moving.
Your blood vessels are the highways and side streets.
Your blood carries the deliveries.
And your brain cells are some of the busiest destinations in the entire system.
Large arteries branch into progressively smaller vessels, eventually reaching tiny capillaries that help deliver oxygen and nutrients throughout brain tissue.
This network is incredibly sophisticated.
The brain even has mechanisms that help regulate its own blood flow as conditions change.
That's important because neurons have high energy demands but limited ability to store their own fuel.
They depend heavily on a continuous supply.
Simple—but incredibly important.
What Does Circulation Have to Do With Cognitive Health?
This is where the heart-brain connection becomes especially interesting.
For years, cardiovascular health and cognitive health were often discussed almost as separate areas of medicine.
That's changing.
Researchers now recognize that vascular factors can contribute to cognitive health and cognitive impairment, alongside neurological, genetic, metabolic, environmental, and lifestyle influences.
In May 2026, the American Heart Association published an updated scientific statement specifically examining vascular contributions to cognitive impairment and brain health. The statement emphasizes that age-related cognitive impairment can have multiple interacting causes and that vascular factors are an important part of that larger picture.
That includes factors such as:
- Blood pressure
- Diabetes
- Cholesterol
- Arterial health
- Smoking
- Physical activity
- Other cardiovascular risk factors
Earlier AHA guidance has also identified hypertension, diabetes, atrial fibrillation and high cholesterol among vascular risk factors associated with vascular cognitive impairment.
In other words:
Heart health and brain health aren't two completely separate conversations.
They're interconnected parts of the same body.
What Happens to Our Blood Vessels as We Age?
Just like our skin, muscles, joints, and bones, our blood vessels change over time.
Healthy arteries are naturally flexible.
They expand and contract as blood moves through them, helping the cardiovascular system adapt to changing demands.
As we get older, arteries can gradually become stiffer and vascular function can change.
Lifestyle matters here, too.
Blood pressure.
Movement.
Diet.
Smoking.
Sleep.
Metabolic health.
All of these can influence vascular health over decades.
And that's why healthy aging isn't something we suddenly begin thinking about at 70.
The habits we establish in our 30s, 40s, and 50s become part of the foundation we're building for later life.
Related Reading: What Happens to Your Arteries as You Age—and How to Support Them Naturally
So Where Does Nattokinase Enter the Conversation?
This is where an important distinction needs to be made.
Nattokinase is not a conventional "brain supplement."
It's an enzyme originally isolated from natto, the traditional Japanese food made by fermenting soybeans with Bacillus subtilis var. natto.
Researchers have primarily been interested in nattokinase because of its relationship with cardiovascular and circulatory health, particularly its fibrinolytic activity.
Fibrinolysis is the body's natural process for breaking down fibrin, a protein involved in normal blood-clot formation.
Nattokinase has demonstrated fibrinolytic activity in laboratory research, which is one reason scientists began investigating it in the context of cardiovascular wellness. Reviews of the research have also examined possible antithrombotic, blood-pressure, inflammatory and oxidative-stress pathways, although the strength of evidence varies considerably among these areas.
And that's where the brain-health question becomes interesting.
If researchers increasingly recognize vascular health as one component of long-term brain health...
and nattokinase is primarily being studied for cardiovascular and circulatory effects...
then it's reasonable to ask:
Could supporting vascular wellness also be relevant to the broader conversation about healthy cognitive aging?
That's a question worth studying.
But it is not the same as saying nattokinase has been proven to improve memory, prevent dementia, or treat neurological disease.
At this point, the evidence does not establish those claims.
And that distinction matters.
🧠 Myth Spotlight
"Nattokinase Is a Brain Supplement"
❌ Myth
Nattokinase directly boosts memory, focus, or cognitive performance like a nootropic.
✅ What We Actually Know
Nattokinase is primarily researched in relation to circulatory and cardiovascular health, not as a traditional nootropic.
The brain connection is more indirect—and arguably more interesting.
Healthy brain function depends partly on healthy vascular function.
So instead of asking: "Will nattokinase make my memory better?" a more scientifically useful question may be:
"How does maintaining cardiovascular and circulatory wellness throughout adulthood contribute to long-term brain health?"
That's a much bigger conversation.
What About Blood Pressure?
Blood pressure gives us one of the clearest examples of the heart-brain connection.
Healthy blood pressure isn't only important for the heart.
Over time, hypertension can affect blood vessels throughout the body including those supplying the brain. That's one reason managing vascular risk factors has become an important component of healthy-brain-aging research.
Nattokinase research here is interesting, although results aren't perfectly uniform.
A randomized, double-blind, placebo-controlled trial involving adults with untreated prehypertension or stage 1 hypertension found reductions in systolic and diastolic blood pressure after eight weeks of nattokinase supplementation compared with placebo.
A later systematic review and meta-analysis of randomized controlled trials also reported modest reductions in systolic and diastolic blood pressure overall.
However, another longer randomized trial involving 265 adults at low cardiovascular risk found no significant effect of 2,000 FU of nattokinase daily on blood pressure, carotid arterial stiffness, subclinical atherosclerosis progression, or the laboratory markers evaluated over approximately three years.
Why mention the negative study?
Because good wellness education shouldn't cherry-pick.
The evidence is promising in some areas, mixed in others, and still evolving.
That's exactly why nattokinase continues to be studied at various dosages and for various health benefits (not just the heart!).
The Heart-Brain Connection Matters Long Before You're "Old"
There's another misconception worth challenging:
Healthy aging begins when you're old.
It doesn't.
You don't wake up on your 68th birthday with an entirely new cardiovascular system.
Aging happens gradually.
That means the habits you practice today become part of your health story later.
In your 30s, that might mean establishing consistent movement and nutrition habits.
In your 40s, you may start paying closer attention to blood pressure, cholesterol, sleep, stress, and metabolic health.
In your 50s and beyond, preserving strength, mobility, cardiovascular fitness, and vascular wellness becomes increasingly important.
And brain health belongs in that conversation at every stage.
A 2026 American Heart Association scientific statement on brain health across the lifespan emphasizes that brain wellness reflects many interacting influences, including physical health, sleep, mental health, environmental factors, and other biological and lifestyle factors.
There is no single "brain health" switch. And there certainly isn't one supplement that controls it.
Healthy aging is a system.
6 Ways to Support Your Brain with Heart Health
The encouraging part of this conversation is that many of the habits associated with cardiovascular wellness are already familiar.
1. Move Regularly
I'm sure you have heard the phrase "Use it or lose it". It's not a scientific statement but it does have some merit to it. But as we know, a object in motion stays in motion.
So keep moving! Yes, walking counts. So does cleaning the house, doing some work in your garden, and mowing the lawn.
If you enjoy cycling, swimming, resistance training, hiking, dancing - keep doing it! Pick whatever form of movement you'll actually enjoy and continue doing.
The goal isn't perfection. It's remembering to keep moving and avoiding a consistently sedentary lifestyle.
2. Know Your Blood Pressure
High blood pressure frequently doesn't announce itself with obvious symptoms.
Knowing your numbers gives you information you can actually use.
3. Eat With Your Cardiovascular System in Mind
Build meals around foods such as vegetables, fruit, legumes, whole grains, nuts, seeds, and other minimally processed foods while considering your individual nutritional needs.
Feeding your heart and brain the nutrients, vitamins and proteins it needs to thrive is crucial and that alone can change someone. We all love a good pizza night and that's okay occassionally.
Think patterns, not perfection.
4. Prioritize Sleep
Your brain doesn't clock out when you do.
Sleep supports numerous processes related to brain and whole-body health, making consistent, restorative sleep an important part of the healthy-aging picture.
5. Don't Smoke
Smoking is a major modifiable cardiovascular risk factor, and protecting blood vessels is one more reason to avoid tobacco.
6. Think in Decades, Not Days
This might be the most important one.
Healthy aging isn't created by the smoothie you drank this morning.
Or the workout you did yesterday.
Or the supplement you started last week.
It's built from what you repeatedly do.
Small habits become routines.
Routines become years.
And years become your health story.
A Japanese Perspective: Healthy Aging Is a Long Game
Natto has been part of Japanese cuisine for centuries.
But we would never suggest that eating one traditional food explains Japanese longevity.
Japanese wellness culture offers a much bigger lesson.
Movement woven into everyday life.
Seafood and plant foods.
Fermented foods.
Smaller portions.
Social connection.
Daily rituals.
Consistency.
There isn't one secret.
The pattern is the secret.
And perhaps that's the most useful lesson when thinking about heart health, brain health, or healthy aging in general.
You don't need to completely transform your life tomorrow.
You need to build habits you're willing to keep practicing.
Ready to Think Beyond Heart Health?
If today's article changed the way you think about circulation, that's exactly what we hoped it would do.
Healthy circulation isn't only about your heart. It's part of a much larger whole-body wellness story—and scientists are continuing to uncover just how interconnected those systems really are.
If you're interested in making nattokinase part of your own daily wellness routine, we'd love to introduce you to Crane Wellness Nattokinase Blend 6,000 FU, made in Japan with nattokinase alongside Okinawa Moromi Vinegar, Aomori Garlic Extract, and GABA.
Explore Nattokinase Blend 6,000 FU and learn more about the Japanese ingredients behind our formula.
*Please Note: If you take prescription medications - particularly anticoagulant or antiplatelet medications - or have a bleeding disorder or upcoming surgery, talk with your healthcare professional before using nattokinase or any other supplements.
Here's to Healthy Aging. From Heart to Brain
We often divide wellness into categories.
Heart health.
Brain health.
Metabolic health.
Sleep.
Nutrition.
But your body doesn't operate in categories. Its systems are constantly interacting.
Your heart supplies your brain. Your brain helps regulate your body.
Sleep influences both.
Movement affects almost everything. That's why supporting healthy aging means looking at the bigger picture.
And sometimes that begins with something as fundamental as taking care of the network that keeps oxygen and nutrients moving throughout your body.
Healthy circulation really is a whole-body conversation.
Curious if Nattokinase is right for you? Learn more about our Nattokinase Blend here.
Frequently Asked Questions
Is nattokinase good for brain health?
Nattokinase is primarily studied for cardiovascular and circulatory effects rather than as a direct cognitive supplement. Because vascular health is an important component of overall brain health, researchers' growing understanding of the heart-brain connection makes this an interesting area for further study. Current evidence does not establish that nattokinase improves memory or prevents dementia.
Does nattokinase increase blood flow to the brain?
There isn't sufficient clinical evidence to conclude that nattokinase supplementation specifically increases cerebral blood flow in humans. Most human research has focused on cardiovascular markers rather than direct measurements of brain perfusion or cognitive performance.
Is nattokinase a nootropic?
No. Nattokinase isn't conventionally classified as a nootropic. It's a fibrinolytic enzyme primarily researched for cardiovascular and circulatory applications.
What does circulation have to do with memory?
Brain tissue requires continuous delivery of oxygen and nutrients through the vascular system. Researchers increasingly recognize vascular health as one factor involved in cognitive health and age-related cognitive impairment.
Why is blood pressure important for brain health?
Chronically elevated blood pressure can affect blood vessels throughout the body, including those supplying the brain. Hypertension is among the recognized vascular risk factors associated with cognitive impairment.
When should I start thinking about vascular health?
Healthy vascular habits matter throughout adulthood. Rather than waiting until problems develop, regular movement, balanced nutrition, good sleep, avoiding smoking, and knowing important health markers can all contribute to a long-term preventive wellness strategy.
