The only cardiovascular brand that 3rd-party tests every batch.
We tested 7 of America's top-selling Nattokinase brands. Every single one was underdosed — one had just 17.8% of what was on the label. So we built the one we'd take ourselves: manufactured in our own facility, independently lab-verified every batch, every certificate published online. Shop Lab-Verified Nattokinase → See the investigation
Join the 100,000+ Americans already on it.
We test every batch, then publish the results.
The supplement industry's dirty secret is that most brands never test what they sell. We do the opposite. Every batch we manufacture is sent to SORA Labs, an ISO 17025:2017 accredited third-party laboratory, before it ever reaches your door. Every Certificate of Analysis is published online — scannable, searchable, and free to view.
Raw ingredients tested on arrival
Every raw ingredient is tested for heavy metals, microbials, and potency before it enters our Oxford facility. If it fails, it never goes into production.
Manufactured in-house under GMP
We don't outsource to contract manufacturers. Every capsule is made in our own GMP-certified UK facility in Kidlington, Oxford — fully traceable, batch by batch.
Finished batch tested independently
A sample from every finished batch goes to SORA Labs for third-party verification. Potency, purity, heavy metals, microbial contamination — all tested by an accredited lab with zero ties to us.
Certificate published before shipping
Every Certificate of Analysis is uploaded to our public testing database. Scan the batch code on your bottle and read the exact lab report for the capsules in your hand.
ISO 17025:2017
ACCREDITED
We tested 7 of America's top brands. All 7 were ripping people off.
We bought the best-selling Nattokinase pills on Amazon and sent them to SORA Labs (ISO 17025:2017) — the same accredited laboratory we use for our own batches. Same enzyme assay. Same lab. Same day.| Brand | Label Claim | Lab Result | % of Claim | Verdict |
|---|---|---|---|---|
| NF Supplements ★ | 5,000 FU / capsule | >6,720 FU / capsule | 134% | Pass |
| Horbaach | 4,000 FU / 2 caps | 3,720 FU / 2 caps | 93% | Marginal |
| Double Wood | 4,000 FU / 2 caps | 2,800 FU / 2 caps | 70% | Fail |
| Luma Nutrition | 4,000 FU / 2 caps | <2,660 FU / 2 caps | <66.5% | Fail |
| Bulk Supplements | 4,000 FU / capsule | <2,680 FU / capsule | <67% | FAIL |
| Hybrid Health | 5,000 FU / 2 caps | 1,380 FU / 2 caps | 27.6% | FAIL |
| Raibu | 2,000 FU / capsule | 528 FU / capsule | 26.4% | FAIL |
| Vinco | 4,000 FU / 2 caps | 711 FU / 2 caps | 17.8% | FAIL |
Watch our full investigation. We show you the labels, the lab reports, and the math.
Every American over 40 should know about this.
Watch Dr. Karen Vieira, PhD explain why Nattokinase matters so much for Americans right now — and why most heart-health pills on the shelf today are letting people down.Dr. Karen Vieira, PhD — Biomedical Sciences researcher and published author on enzyme therapeutics.
Nattokinase Arterial Support
5,000 FU of pure, lab-verified nattokinase enzyme — the exact dose used in the clinical studies that proved it works on arterial plaque.
- 5,000 FU of clinically-studied nattokinase per capsule
- SORA Labs verified — >134% of label claim
- Manufactured in our own GMP facility
- Fermented from non-GMO soybeans
- Vegan, gluten-free, no fillers or binders
- One capsule a day · 30 servings per bottle
Nattokinase Capsules - Arterial Support Capsules
Nattokinase Capsules - Arterial Support Capsules
Nattokinase is an enzyme derived from fermented soybeans (natto).
- For Cardiovascular Health*
- Increases Elasticity & Strength Of Artery Walls*
- Strengthens Blood Vessels*
- Improves Function Of The Heart*
Strength
5000 FU
10000 FU
As Seen On
I built this brand because I was sick of being lied to.
I watched people I love struggle with heart problems. They took the big-name supplements off Amazon. Nothing changed. So I got curious. I bought the top sellers and shipped them off to a real lab.
What came back made me angry. Most were way underdosed. A couple had almost zero active enzyme. People were paying real money for empty pills.
So I built NF Supplements to be the opposite of all that. We make every batch ourselves. We test every batch with an independent third-party lab. We post every result online. No tricks. No hiding.
This is the Nattokinase I take every single day. I give it to my own parents. There is nothing hidden in here. There never will be. You have my word.
— Logan King, Founder of NF Supplements
Things people ask us.
What makes NF Supplements different from every other supplement brand?
Three things that almost nobody else does — and certainly not all three together.
One: we manufacture in our own GMP-certified facility. We don't subcontract to a third-party blender, which means we control what goes in the capsule, the dose, and the quality of the raw material. Two: every single batch is tested by an independent ISO 17025-accredited laboratory before it ships. Not once a year. Not on samples we cherry-picked. Every batch. Three: we publish every certificate of analysis online, searchable by the batch number printed on your bottle. If you can't verify it, we don't sell it.
Why did you focus on cardiovascular health?
Heart disease is the leading cause of death in the United States and most of the developed world. It's also the area of supplementation with some of the strongest clinical evidence — and unfortunately some of the worst label fraud. We started here because the gap between what the science supports and what the industry actually delivers is widest in this category. Fix the worst category first, then expand.
Who tests your products and how do I see the results?
Every batch is tested by SORA Labs — an independent third-party laboratory accredited to ISO 17025:2017, the international standard for testing competence. Every certificate is published at testing.nfsupplements.co.uk and is searchable by the batch number on your bottle. No login. No paywall. No "request a copy."
Where are your supplements made?
Every capsule is manufactured in our own GMP-certified facility in Kidlington, Oxford, UK. Same building. Same people. Every batch. From there, US orders ship from our United States warehouse — no customs, no import duties, no slow international shipping. Most US customers receive their order in 2–5 business days.
What's your money-back guarantee?
30 days, no questions, no fight. If you're not satisfied for any reason, email us within 30 days of delivery and we'll refund you in full. No forms to fill out, no return shipping to pay. We'd rather give you your money back than have you stuck with something you don't believe in.
How do subscriptions work? Can I cancel anytime?
Subscriptions ship on the cadence you choose (every 30 days or every 90 days). You can pause, skip, reschedule, or cancel any time from your account dashboard with one click. No phone calls. No retention scripts. No fine print. If it's not working for you, you turn it off — that's the deal.
Are your products vegan, non-GMO, and gluten-free?
Yes to all three. Our Nattokinase is fermented from non-GMO soybeans, contains no animal products, and is naturally gluten-free. The capsule shell is vegetable cellulose. No artificial colors, flavors, fillers, or binders.
Can I take your supplements with my prescription medication?
Always check with your doctor first — especially if you take prescription blood thinners (warfarin, apixaban, rivaroxaban, clopidogrel), daily aspirin, high-dose fish oil or vitamin E, statins, or any other heart medication.
Nattokinase enhances the body's natural clot-breakdown process, which can compound the effects of pharmaceutical blood thinners. It's not that the combination is automatically unsafe — it just needs to be monitored by someone with access to your medical history.
Do you ship outside the United States?
Yes. We have dedicated stores for the United States (this site), the United Kingdom (nfsupplements.co.uk), and the European Union. Each ships locally to avoid customs delays and import fees. If you're outside these regions, contact us — we'll figure something out.
How do I contact you with a question?
Email us — a real person responds, usually within one business day. We don't use chatbots, outsourced ticketing, or "your call is important to us" hold music. Logan personally reads customer emails most weeks.