How much nattokinase is in each serving?

Each serving provides 4,000 FU (fibrin units) of nattokinase as Subtilisin NAT. That falls within the 2,000 to 10,800 FU range used in published human research.

When should I take it?

The brand advises taking nattokinase away from meals. If you also take D3K2, take that with a fat-containing meal instead.

Is it vegan and gluten-free?

Yes. It is vegan, gluten-free and non-GMO, and made in a cGMP-certified U.S. facility from globally sourced ingredients.

What else is in the formula besides nattokinase?

It includes a digestive enzyme blend of bromelain, amylase, protease, cellulase and lipase, plus small amounts of calcium and magnesium.

Is 4,000 FU enough, or should I take more?

4,000 FU is a mid-range dose within the studied range. Some buyers prefer 10,000 FU, so check with your doctor before exceeding the label serving.

Where is the Nattokinase Supplement cheapest?

At Double Wood Supplements, for $19.95, as of our latest check.

What do buyers say about the Nattokinase Supplement?

Rated 4.8 out of 5 from 102 ratings. Buyers like: Good quality and third-party testing results; Working as expected; Fast shipping and timely arrival. Common complaints: Wishes it were dosed for 10,000 FU; Wishes it came in a larger dose.

Nattokinase Supplement Price History: Lowest $19.95

Q: How is the enzyme activity verified?

Every batch is tested by an ISO/IEC 17025-accredited laboratory using a fibrin plate assay against reference standards. The brand states this on the label.

What reviewers say

4.8 / 5102 ratings

Buyers rate it 4.8 out of 5 and praise the quality, the third-party testing results and the brand's reputation. A few wish it came in a stronger dose.

What people mention

Dose strengthMixedBuyers like the 4,000 FU serving but some wish it were dosed at 10,000 FU.
Third-party testingPraisedBuyers value the batch testing and lab-verified enzyme activity.
EffectivenessPraisedBuyers say it works as expected for their circulation routine.
ValueMixedSome buyers want a larger dose or a bigger supply per bottle.

From Double Wood Supplements

4,000 FU (fibrin units) per 2-capsule serving, within the 2,000 to 10,800 FU range studied in published human research
Enzymatic activity verified every batch by an ISO/IEC 17025-accredited lab using a fibrin plate assay
Supports healthy circulation and blood flow as part of a daily cardiovascular wellness routine*
Studied for its interaction with pathways involved in circulation support*
120 capsules, a full two-month supply at the standard daily serving of 2 capsules
Vegan, gluten-free, non-GMO, manufactured in a cGMP-certified U.S. facility from globally sourced ingredients

Materials: Nattokinase (as Subtilisin NAT), 2,000 FU per capsule; 4,000 FU per 2-capsule serving. Contains soy.
Guarantee: 30 Day Money Back Guarantee
Returns: Refunds & Returns: all you need to know; 30 Day Money Back Guarantee
Shipping: Free Shipping on Orders +
Packs: Buy More Save More: One Bottle, Double Pack, Triple Pack

About the Nattokinase Supplement

This nattokinase supplement comes in capsules. Nattokinase is a serine protease enzyme isolated from natto, a traditional Japanese fermented soybean food. It has been studied for its role in supporting healthy circulation and cardiovascular wellness.

Each serving provides 4,000 FU (fibrin units), a measure of enzyme activity. That falls within the 2,000 to 10,800 FU range used in published human research. Enzymatic activity is verified for every batch by an ISO/IEC 17025-accredited laboratory using a fibrin plate assay against reference standards.

Take it away from meals. The formula is vegan, gluten-free and non-GMO, and it contains soy.

Form: Capsule
Key ingredient: Nattokinase (as Subtilisin NAT), 4,000 FU per serving
Also contains: Calcium 14 mg, magnesium 0.04 mg, bromelain 96 GDU, amylase 3,600 DU, protease 16,000 HUT, cellulase 1,000 CU, lipase 685 FIP
Testing: Activity verified every batch by an ISO/IEC 17025-accredited lab (fibrin plate assay)
Diet: Vegan, gluten-free, non-GMO
Allergens: Contains soy
Usage: Take away from meals