4 Of The 5 Nattokinase Brands I Tested Were Fake

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Author avatar By Sarah Michelle Thompson, Last updated May 23, 2025 88.1k Views 🔥 5min read
FAKE Before photo
REAL After photo

23 Weeks (172 days) after using Nattokinase

84%

Spoiler Alert: Nattokinase can be easily faked and you would never know by just looking at the capsule. To know what's real, you have to test. But the tests cost $400 each. Don't worry, I've done it for you!

Read the full story below for all the juicy details on how you can achieve the same results as Marcia (it’s a lot easier than you think).

⚠️ Warning: There is no law requiring supplement brands to test their product. Meaning for all you know, they could be selling sandpaper in capsules...

🧪 Why I Had To Test These Nattokinase Brands Myself

The supplement industry has a dirty secret. After researching nattokinase for cardiovascular health and seeing wildly conflicting reviews, I realized there was only one way to get the truth: independent lab testing.

I purchased 5 of the most popular nattokinase supplements on Amazon and sent them to SORA Labs, an accredited testing facility, to see which brands actually deliver the fibrinolytic activity (FU units) they claim on their labels.

The results were absolutely shocking. 80% of the brands I tested failed to meet their own label claims — some missing over 33% of their promised potency. Here's exactly what I found, backed by certified laboratory analysis.

📊 Official Lab Test Results

✅ Natural Foundation Supplements

Lab Reference: 35260854

Lot Number: N1571

Label Claim: 5,000 FU per capsule

Lab Result: >6,720 FU per capsule

Capsule Weight: 606.7 mg

134%+ Potency
✓ Exceeds Claims by 34%+

The Winner: This premium sample proves that high-quality nattokinase supplements do exist — they just cost more to manufacture properly.

❌ Horbaach Nattokinase

Lab Reference: 35170634

Lot Number: 541936

Label Claim: 4,000 FU per 2 capsules

Lab Result: 3,720 FU per 2 capsules

Capsule Weight: 764.7 mg per 2 capsules

93% Potency
✗ 7% Underdosed

Missing 280 FU units per serving. While not the worst performer, you're still not getting what you paid for.

❌ Bulk Supplements Nattokinase

Lab Reference: 35170661

Lot Number: GC2511803

Label Claim: 4,000 FU per capsule

Lab Result: <2,680 FU per capsule

Capsule Weight: 176.7 mg per capsule

<67% Potency
✗ 33%+ Underdosed

Severely underdosed: Missing over 1,320 FU units per capsule. You're getting less than 2/3 of what you're paying for.

❌ Double Wood Nattokinase

Lab Reference: 35170626

Lot Number: 2506901

Label Claim: 4,000 FU per 2 capsules

Lab Result: 2,800 FU per 2 capsules

Capsule Weight: 333.1 mg per 2 capsules

70% Potency
✗ 30% Underdosed

Missing 1,200 FU units per serving. That's a massive shortfall for cardiovascular support.

❌ Luma Nutrition Nattokinase

Lab Reference: 35170642

Lot Number: 25169

Label Claim: 4,000 FU per 2 capsules

Lab Result: <2,660 FU per 2 capsules

Capsule Weight: 1,038.6 mg per 2 capsules

<66.5% Potency
✗ 33.5%+ Underdosed

The worst performer: Missing over 1,340 FU units despite having the largest capsules. Capsule size means nothing without proper potency.

Purchase The Winner Of This Test

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🚨 Shocking Discoveries That Will Save You Money

  • 4 out of 5 brands completely failed to meet their own label claims
  • Some brands delivered less than 67% of their promised fibrinolytic activity
  • Bigger capsules don't mean higher potency — Luma had the largest capsules but worst results
  • You could be wasting hundreds of dollars on supplements that don't provide therapeutic benefits
  • Only premium-grade manufacturing consistently delivers what's promised on the label
  • Most popular doesn't mean most effective — these were all top-selling Amazon brands

🔬 How This Testing Was Conducted

Testing Facility: SORA Laboratories — Accredited analytical testing laboratory

Primary Test Method: GM0068 (Nattokinase Units/Fibrinolytic Activity)

Secondary Test: GM0009 (Serving Size Fill Weight Verification)

Sample Conditions: All samples stored and tested under controlled conditions (25.3°C)

Quality Assurance: Method validation conducted for every sample matrix

Documentation: Complete certificates of analysis available with reference numbers

Testing Standard: ISO 17025:2017 scoped testing procedures

💡 What These Results Mean for Your Health

❌ The Problem with Most Nattokinase Brands:

  • Underdosed formulations that won't provide the cardiovascular benefits you're seeking
  • Poor quality control during manufacturing leading to inconsistent potency
  • Misleading marketing claims that don't match actual laboratory results
  • Wasted money and time taking supplements that barely work
  • False sense of security thinking you're supporting your heart health when you're not

✅ What to Look For in Quality Nattokinase:

  • Third-party lab testing certificates for potency verification (not just purity)
  • Products that exceed label claims rather than falling short
  • Transparent manufacturing processes with proper quality control
  • Proper storage and shipping to maintain enzyme activity
  • Certificates of Analysis available upon request with specific lot numbers
  • Higher initial cost but actual value delivered per FU unit

🎯 The Bottom Line

Don't gamble with your cardiovascular health on underdosed supplements. These lab results prove that most popular nattokinase brands fail to deliver therapeutic levels of fibrinolytic activity. Your heart deserves a supplement that actually contains what's on the label — not 67% of it.

Purchase The Winner Of This Test

30-Day Money Back Guarantee

Purchase The Winner Of This Test

30-Day Money Back Guarantee

Lab Test Certificate

×

This Nattokinase is 3rd Party Tested & Doctor Reccomended

Taking the Leap of Faith

I called my doctor to ask about Nattokinase. He was skeptical but admitted he'd heard of some promising research. "It's natural and generally safe," he said. "If you want to try it alongside monitoring your condition, I don't see any harm."

That was enough for me.

I ordered my first bottle that same day, choosing a pharmaceutical-grade version with 5,000 FU (the active measurement Dr. Vieira recommended).

I started with two capsules daily – one in the morning, one at night.

To be completely honest, I didn't expect miracles. I just wanted to feel like I was doing something proactive instead of sitting around waiting for disaster.

I Trusted The Science...

Natto Consumption & Cardiovascular Mortality
13,355 men & 15,724 women · Average age: 55 years · 16 years follow-up
−25% Lower Cardiovascular Mortality
−31% Lower Risk of Stroke Death
−33% Lower Ischemic Stroke Death

In a 16-year study of over 29,000 Japanese adults, higher intake of natto was significantly associated with reduced risk of cardiovascular and stroke mortality. Those with the highest natto intake had a 25% lower risk of cardiovascular death, a 31% lower risk of all stroke deaths, and a 33% lower risk of ischemic stroke mortality compared to those with the lowest intake.

Nattokinase & Artery Plaque
4-year clinical study of 1,062 people taking nattokinase daily
−36% Artery Plaque Reduced
77% Improved Artery Thickness

In a large 4-year study of 1,062 people, daily supplementation with nattokinase significantly improved cardiovascular health. Artery plaque decreased by up to 36%, and 77% of participants showed measurable improvements in artery wall thickness. These results provide strong evidence for nattokinase’s potential in protecting heart health and circulation.

The First Signs Something Was Working

About three weeks in, I noticed something strange. I wasn't getting winded walking up the stairs to my bedroom.

Was it my imagination?

By week 6, I realized I had more energy throughout the day. That afternoon fatigue that had plagued me for years was... gone.

My hands and feet, which had always been cold (my husband used to joke about my "ice cube toes"), were staying warm even on chilly mornings.

But the most dramatic change was mental. The constant brain fog I'd accepted as "normal aging" started lifting. I could focus on conversations, remember names, and think clearly for the first time in years.

Maybe this Japanese enzyme was actually doing something...

The Moment That Proved Everything

Six months after starting Nattokinase, it was time for my follow-up CT scan. I was nervous but cautiously optimistic.

When my doctor called with the results, his voice was completely different than it had been six months earlier.

"Marcia, I have to admit – I'm surprised. Your plaque buildup has decreased by approximately 20%. This is remarkable improvement, especially without surgical intervention."

I nearly dropped the phone.

Twenty percent less plaque. In just six months.

The dangerous blockages that had terrified me were actually shrinking.

My doctor wanted to know exactly what I'd been doing differently. When I told him about the Nattokinase, he made notes in my chart and said he was going to research it further for other patients.

How My Entire Life Transformed

The plaque reduction was just the beginning. Over those six months, I experienced changes I never expected:

My Energy Returned: I went from barely being able to climb stairs to taking 3-mile walks with my neighbor every morning. I had stamina I hadn't felt since my 40s.

My Mind Became Sharp Again: The mental fog that I'd blamed on "getting older" completely disappeared. I could read entire books again, follow complex TV shows, and my memory was better than it had been in decades.

My Circulation Improved Dramatically: No more cold hands and feet. My skin had a healthy glow people started commenting on. Small cuts and bruises healed faster than they had in years.

My Sleep Became Restorative: Instead of tossing and turning with worry, I started sleeping deeply through the night and waking up refreshed.

Most Importantly – The Fear Was Gone: I stopped feeling like a walking time bomb. I could live my life again instead of constantly worrying about when disaster might strike.

Why I'm Sharing This Story

I'm not a doctor. I'm not a health expert. I'm just a 63-year-old grandmother who was scared for her life and found something that worked.

But I'm sharing this because I know there are thousands of people out there feeling exactly like I felt six months ago.

Scared. Hopeless. Convinced their best days are behind them.

If you're dealing with:

  • Cardiovascular concerns or high blood pressure
  • Constant fatigue and low energy
  • Brain fog and memory issues
  • Poor circulation (cold hands and feet)
  • Slow healing from minor injuries
  • The fear that comes with aging and declining health

You don't have to accept that as your "new normal."

Finally, A Supplement That Actually Works

What My Family Sees Now

My daughter Sarah says I'm like a different person. "Mom, you have your spark back. You're not afraid anymore, and you're doing things you haven't done in years."

My husband jokes that he married a 63-year-old but now lives with someone who acts like she's 45.

My grandchildren have their active grandmother back – the one who can keep up with them at the park, play games that require focus, and has the energy for spontaneous adventures.

But most importantly, I have my confidence back.

I wake up each morning excited about the day instead of worried about what might go wrong with my health.

A Warning About Waiting

Here's something I learned the hard way: cardiovascular problems don't get better by themselves.

Six months ago, I was getting worse every day. The plaque was building up, my circulation was declining, and my health was on a downward spiral.

If I had waited another six months to take action? I might not be here to tell this story.

The truth is, every day you wait is another day of:

  • Plaque potentially building up in your arteries
  • Your circulation getting worse
  • Your energy continuing to decline
  • Missing out on the active, vibrant life you deserve

Your heart, your brain, and your entire body are depending on proper blood flow. Don't wait until a doctor shows you scary scan results like mine.

READ THIS BEFORE YOU ORDER

I read something that made me pause...

The results I was seeing in those studies didn't happen overnight.

The 36% plaque reduction? That took 1 year of consistent daily use.

The dramatic improvements people were posting about on Reddit? Most mentioned taking nattokinase for 6-12 months before their follow-up scans showed real change.

At first, I was frustrated. I wanted results NOW.

But then I learned something that changed my perspective completely...

You actually WANT this process to happen slowly.

Here's why: If arterial plaque breaks away in big chunks, those chunks can travel to your brain and cause a stroke.

That's the last thing you want.

But nattokinase works differently. It gradually dissolves the fibrin matrix holding the plaque together, allowing your body to process tiny particles safely over time.

Think of it like slowly chiseling away at an ice dam instead of blowing it up with dynamite.

The small, dissolved particles get filtered out naturally through your kidneys and eliminated in your urine.

Safe. Controlled. The way your body was designed to handle it.

That's when I realized this wasn't just about getting results fast.

This was about getting results SAFELY.

So instead of buying a single bottle and hoping for a miracle, I signed up for their 6-month subscription.

Because if I was going to reverse years of plaque buildup, I needed to be in this for the long haul.

And honestly? Knowing I had a steady supply coming automatically took the pressure off.

No more worrying about running out. No more questioning whether I should continue.

Just consistent, daily support for my cardiovascular system to do what it was meant to do...

"Taking instead of wa***rin"

One month after taking this k2 supplement, my cholesterol levels tumbled from 6 to 4.5! That’s a win for me

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"I have just ordered my 2nd batch. I am due heart surgery in the coming weeks and my surgeon is happy with my blood flow and cholesterol"

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"Nattokinase works..."

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