We tested 8 nattokinase brands at an ISO 17025 lab. 6 of them failed.

SORA Labs is an independent ISO 17025:2017 accredited analytical laboratory based in Forsyth, Missouri, USA. We chose them because the GM0068 fibrinolytic unit assay is their specialty — it's the standard method for measuring nattokinase enzyme activity. They've been accredited for testing and calibration to international standards.

FU stands for Fibrinolytic Units, the standard measure of nattokinase enzyme activity. Unlike milligrams (which only measure weight), FU measures how effectively the enzyme can break down fibrin. A label that lists only milligrams tells you nothing about how potent the enzyme actually is. The only way to verify FU is through a lab assay like GM0068.

Nattokinase enzyme activity degrades during manufacturing, storage and shelf life. Many manufacturers do not formulate above label claim to account for this — and there is no legal requirement in the UK or US for supplement brands to verify potency through independent testing before selling. Without mandatory testing, some brands sell products that never met their claim from the start.

Yes. Natural Foundation Supplements commissioned and funded the testing. All products were purchased directly from retail channels (Amazon and brand websites) — not supplied by manufacturers. Every Certificate of Analysis is published publicly so anyone can verify the results independently.

Our result exceeded the upper limit of the linear assay range, meaning our actual potency could be even higher than 6,720 FU. The same caveat applies in reverse to Luma Nutrition and Bulk Supplements — their values fell below the linear range, so the lab can only confirm they are below the stated thresholds.

Each capsule contains 5,000 FU of Nattokinase alongside Motherwort (Leonurus cardiaca) and Oregano (Origanum vulgare) extracts — clinically studied and traditionally used ingredients for cardiovascular and arterial support.

A fibrinolytic enzyme derived from natto, a traditional Japanese fermented soybean food. It has been widely researched for cardiovascular health, including support for healthy blood pressure, circulation and arterial function.

We test every single production batch through SORA Labs before it ships to customers. Every Certificate of Analysis is published at testing.nfsupplements.co.uk. Check the batch number on your bottle, search the database, and you'll find the exact lab paperwork for your product.

1 capsule per day with water, preferably with a meal.

Some notice changes within weeks, but full benefits in clinical research are seen over a 12-month course.

Most clinical studies on nattokinase use dosages between 2,000 FU and 5,000 FU per day. Our product provides the upper end of that range. This is also why brands testing at 528 FU or 711 FU per serving fall below the threshold of meaningful clinical research.

Nattokinase may interact with anticoagulant (blood-thinning) medications. If you take any blood-thinning medication or have a bleeding disorder, consult your GP or healthcare provider before starting.

Yes — vegetable capsules, no animal-derived ingredients.

Manufactured in our own GMP-certified facility in Oxford, UK. Every batch is third-party tested before shipping.

Contains soy (nattokinase is derived from fermented soybeans). Free from gluten, dairy, nuts, artificial colours and preservatives.

Dispatched same/next day. UK delivery 1–3 working days.

Yes for 3-month autoship plans. Small fee for monthly or one-time orders.

Anytime — no lock-in, no penalty.