Everyday support for healthy circulation, blood pressure, and heart health.
Supports heart health
You've tried supplements that didn't deliver. That's why we back ours for 60 days. If you're not thrilled, send back the empty bottle and we'll refund your purchase, no hassle.
Two capsules a day is easy. My wife and I take them together with our coffee. We both feel more active, and I’d recommend it to friends my age.
I tried eating natto once and never again. These capsules go down easy, with no aftertaste and no stomach upset. It’s just part of my morning routine.
They told me upfront it takes time, and honestly that’s why I trusted this brand over the others. By week six I could tell a difference. Already reordered.
I’d tried two other nattokinase brands and felt nothing. The lab testing is what made me give this one a shot. About three weeks in, my hands and feet feel warmer in the morning. I’m staying with it.
My doctor has me on a blood thinner, so I was nervous about any supplement. I showed him the label, and he was glad the K2 was removed. I take it every morning with breakfast now
I'd tried two different nattokinase brands from Amazon and felt absolutely nothing, so I figured it was just another supplement that didn't work. Then I read that most of them are underdosed and don't even contain what the label says. That made me mad enough to try one more time with a higher dose that was actually lab tested. By week three my hands weren't ice cold anymore, and my husband noticed I was taking the stairs without stopping halfway. I'm not saying it's magic, but for the first time in a long time I feel like something is actually working. I've already reordered.
I've been on a blood thinner for years and hate the bruising and the constant worry. Every nattokinase I looked at had vitamin K2 in it, which my doctor told me to watch. I liked that this one has it removed, and I showed the bottle to my doctor before I started. Been taking it for about two months now. More energy in the afternoons and I feel steadier overall. Anyone on prescriptions should talk to their doctor first, but I'm glad I found one made with people like me in mind.
After my husband's scare, I researched everything. The lab testing sold me. Six weeks in, he says his legs feel lighter on walks, and I sleep better knowing we're doing something. The 60-day guarantee made it easy.
FU (fibrinolytic units) measure the enzyme's activity. Typical brands give you 2,000 FU per serving. We formulated at 10,800 FU - more than 5× that - to match the higher intakes used in modern research. You'd need a handful of ordinary capsules to equal one serving of ours.
Nattokinase is a protein enzyme, and stomach acid destroys unprotected enzymes before they can be absorbed. Our acid-resistant, delayed-release capsules carry the enzyme past the stomach so it reaches the intestine — where absorption actually happens — intact.
Natural natto is rich in vitamin K2, which can interfere with common medications like warfarin. We remove it entirely, so you get pure nattokinase activity — and a cleaner conversation with your doctor.
Enzyme supplements live or die on activity, and labels are easy to print. Every batch of Ultimate Nattokinase is tested by an ISO-17025 accredited US laboratory for FU potency, heavy metals, and microbial safety. The Certificate of Analysis is yours on request.
Published studies on Improvement in Plaque Health
Improved In Artery Open & Relaxation
Improvement in Artery Thickness
Customers who love our products and services
Deliberately formulated without vitamin K2, for people whose doctors said ‘watch the K’
For more than a thousand years, mornings in Japanese homes have often begun with a bowl of natto: savory, sticky fermented soybeans.
In 1980, a Japanese researcher found a unique enzyme in natto and called it nattokinase. Scientists are still studying how it relates to circulatory health.
The catch is that nattokinase products aren't all equal, and strengths differ from brand to brand. Each serving here provides 10,800 FU, and we've intentionally left out vitamin K2.
Your transformation
Consistency matters. Here is a general look at how progress may unfold over time.
1 Week
Why: Delayed-release capsules begin carrying the full 10,800 FU dose past stomach acid, intact, into the small intestine — where absorption starts working with your circulation from day one.
1 Month
Why: Nattokinase supports healthy blood flow with consistent daily use, and many people notice this first as more even energy rather than a specific number.
2 Months
Why: Sustained dosing at a clinical-strength 10,800 FU allows the supportive effects on circulation to build over weeks, not days.
3 Months
Why: Sustained dosing through this stretch is the timepoint the largest published nattokinase study (1,062 participants) associated with the most consistent improvement in circulation-related markers.
6 Months
Why: Nattokinase is studied to support blood pressure already within a healthy range with sustained daily use — this is the timepoint the largest published study (1,062 participants, avg. age 67.5) associated with the most consistent results at the clinical-strength 10,800 FU dose.
It's a 10,800 FU nattokinase supplement in delayed-release, acid-resistant vegetarian capsules. Nattokinase is an enzyme originally isolated from natto, the fermented soybean food Japan has eaten for centuries. Each serving is two capsules. Every batch is tested by an ISO-17025 accredited U.S. laboratory, and vitamin K2 is deliberately removed.
Because 2,000 FU is a convention, not a proven ceiling. A 2022 study in Frontiers in Cardiovascular Medicine followed 1,062 participants (average age 67.5). At 10,800 FU per day, the authors reported improvement rates of 66.5% to 95.4% across the markers they measured. They also described 3,600 FU per day as ineffective and said their results challenge the recommended 2,000 FU dose. We formulated at the dose that study used.
No, and we won't pretend it is. It was an observational, retrospective study, not a double-blind randomized trial. It is the largest human dataset on nattokinase dosing that we're aware of, and it's why we chose this dose. We publish the citation so you can read it yourself, and we encourage you to bring it to your doctor.
Nattokinase is a protein enzyme, and stomach acid can break down unprotected enzymes. Delayed-release capsules are designed to get past the stomach and open in the intestine, where absorption happens. The goal is that the dose on the label is the dose your body can actually use.
Because we can't guarantee what happens to a product once it enters a marketplace with mixed sellers and counterfeits. Selling only through our official website means the bottle you receive is the one we tested and shipped.
We remove vitamin K2, which matters for people on warfarin, since K2 is the vitamin that can interfere with that medication. But removing K2 doesn't make ViraFit interchangeable with a prescription or free of interaction concerns. Nattokinase itself may affect how your blood clots, so anyone on anticoagulants, antiplatelet drugs, or blood-pressure medication should have their doctor involved. Please never stop or change a prescribed medication on your own.
Two capsules once daily. Consistency matters more than timing.
You can, and many people do. But natto's taste and texture are famously divisive, the enzyme activity in a serving varies widely, and natural natto is high in vitamin K2. ViraFit delivers a standardized, tested dose without the K2 and without the smell.