Nattokinase has quietly become one of the most sought-after supplements in the UK — a concentrated enzyme from a traditional Japanese food, chosen by people who take a considered, research-led approach to their wellbeing. If you are looking at it, this guide will help you choose a good one, and choose it well.
I sell a nattokinase supplement, so weigh that as you read. What I can offer in return is the straight version: what it is, the one number that separates a serious product from a weak one, and the safety points worth knowing so you can buy with confidence.
What nattokinase is
Nattokinase is an enzyme extracted from natto, a traditional Japanese food made by fermenting soybeans with the bacterium Bacillus subtilis. It was first isolated in the 1980s, and supplements deliver it in a concentrated, standardised form — so you get a consistent amount without eating the fermented soybeans themselves.
Because it is fermented from soybeans it contains soy, and because it is made by bacterial fermentation of a plant it is suitable for vegans — a genuine plus over animal-derived enzymes.
The one number that tells you if a product is any good: FU
This is the most useful thing in this guide, and the fastest way to tell a quality nattokinase from a cheap one.
Nattokinase is an enzyme, and what matters about an enzyme is its activity, not its weight. So it is measured in fibrinolytic units (FU) — a standardised measure of enzyme activity — not by milligrams alone. Two products can both say “100mg” and deliver completely different activity. The commonly researched level is 2000 FU.
So here is your quality test: look for the FU figure. A product that states a proper FU count — ideally 2000 FU — is giving you the number that actually matters. A product that hides behind milligrams alone, with no FU, is hoping you won’t ask. That single check will steer you to the serious products and away from the filler.
What to look for in a good nattokinase
- A stated FU figure, ideally 2000 FU — the researched activity level.
- Soy allergen clearly declared — a sign the label is done properly.
- Vegan and made in the UK to GMP standards — an accountable, inspected supply chain.
- A complex, not a bare isolate — some formulas pair the enzyme with supporting botanicals for a rounder product.
- A seller who is straight with you — including honest safety information, below.
A quick word on what we can say
You will see nattokinase sold with big promises. We have to be straight: in Great Britain nattokinase has no authorised health claim, so no seller may lawfully tell you what it does — us included. There is published research you can read and judge for yourself, but we are not permitted to turn it into a promise, and we won’t pretend otherwise. We think that honesty is worth more than a claim we’re not allowed to make.
Using nattokinase sensibly
For most healthy adults, nattokinase is a straightforward daily capsule. There are a few situations where it is worth a quick word with your GP or pharmacist first — chiefly if you take blood-thinning or blood-pressure medication, are pregnant or breastfeeding, or are due for surgery. It is a short conversation, and we cover the detail in our safety guide. If none of those apply to you, nattokinase is a popular, well-established choice.
Our nattokinase — and why it’s a strong choice
Our Nattokinase Complex gives you exactly what this guide tells you to look for:
- 100mg standardised to 2000 FU — the researched activity level, stated plainly, not hidden behind a milligram figure.
- A complex, not an isolate — the enzyme paired with supporting botanicals.
- Vegan, fermented from non-GMO cultures, with the soy allergen clearly declared.
- Made in the UK to GMP standards, and backed by our 60-day guarantee.
At £27.49 for a one-a-day capsule, it is a serious, properly standardised nattokinase from a UK maker who tells you the FU and the safety facts up front. If you’ve decided nattokinase is right for you, it’s a straightforward, confident choice.
Read next: what nattokinase is and where it comes from, and the safety guide. Or browse our cardiovascular range.
Always read the label. Food supplements are not a substitute for a varied and balanced diet and a healthy lifestyle. This article is general information, not medical advice. If you take anticoagulant or blood-pressure medication, are pregnant or breastfeeding, or are due to have surgery, speak to your GP before taking nattokinase.
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