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Dietary supplement

Nattokinase 100 mg Ingredients & Drug Interactions

by Seeking Health

Nattokinase 100 mg label
See full label image
Capsule Category: Non-nutrient/non-botanical
Most serious interaction: Moderate
Clinical methodology reviewed by · Updated Sep 16, 2026 · Label data from the NIH DSLD
What is this page for?

First and foremost: checking Nattokinase 100 mg against your medications. The heart of this page is the interaction checker and the full interaction report — how this product’s ingredients may interact with prescription and over-the-counter medicines you may be taking.

Around that, we add a pharmacist’s high-level view of the product as a whole — what’s inside, the evidence for its stated use, how transparent the label is, and what safety data exists — so you can see the full picture in one place. It’s educational information from our licensed clinical databases and the clinical staff at HelloPharmacist — not medical advice — and we don’t sell or endorse products. Our editorial policy

The interaction bottom line Most serious interaction: Moderate

Nattokinase 100 mg is a dietary supplement by Seeking Health with 1 active ingredient. Its ingredients are commonly taken for heart and circulatory health, blood clot prevention, high blood pressure.Based on those ingredients, 289 medications have a known interaction with it, the most serious rated moderate. The ingredients most likely to interact are Nattokinase NSK-SD. Use the checker below to test your specific medication, or read the full HelloPharmacist Interaction Report.

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Check Your Meds Against Nattokinase 100 mg by Seeking Health

Ask about any prescription or over-the-counter medication and we check it for interactions with Nattokinase 100 mg by Seeking Health — and tell you which ingredient is responsible.

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HelloPharmacist Scorecard of Nattokinase 100 mg by Seeking Health

Our pharmacy team’s full take, with four database checks built into the cards below — a summary of what is known, not a grade of the product itself.

From our pharmacy team — supplement deep dive

Generated from HelloPharmacist’s pharmacist-curated databases and editorial rules · Last generated Aug 27, 2026

What’s inside

Full disclosure
Ingredient Transparency · database check
Full

Every active ingredient lists its own amount on the label.

Why this rating?
  • The label discloses an exact amount for 1 of its 1 active ingredient.
  • No proprietary blends here — you can verify the dose of every single component.

Nattokinase 100 mg contains one active ingredient: nattokinase NSK-SD, an enzyme derived from fermented soybeans (natto). It's believed to work by breaking down blood clots and thinning the blood.

The capsule also includes vegetarian capsule material, L-leucine, cellulose, and silicon dioxide as inactive ingredients.

Does it work?

Not established
Evidence for Intended Use · database check
By FDA rules, dietary supplements can’t claim to treat, cure, or prevent disease — so labels speak in careful marketing language. We discern each product’s intended use from its name, label claims, and label statements, then grade the clinical evidence for that use. How these ratings are computed
Not established

The graded evidence we hold for these ingredients covers different conditions than the ones this product is marketed for, so there's no established rating for its stated use — see Nattokinase's own graded uses on its monograph.

Why this rating?
  • The label markets this product for: Heart and circulatory health support.
  • We looked for evidence on: Atherosclerosis, Cardiovascular disease (CVD), Hyperlipidemia, Hypertension, Peripheral arterial disease (PAD), Venous insufficiency — and 3 related terms.
  • The closest evidence on file: Nattokinase is rated "Insufficient Reliable Evidence To Rate" for Atherosclerosis (Natural Medicines).
  • Also on file: Nattokinase is rated "Insufficient Reliable Evidence To Rate" for Cardiovascular disease (CVD), Hyperlipidemia, Hypertension, Peripheral arterial disease (PAD), and more.

The evidence for nattokinase isn't established in our data. We hold insufficient reliable evidence to rate it for angina, atherosclerosis, cardiovascular disease, cancer, or chronic fatigue syndrome.

If you're considering it for a specific condition, talk with your doctor about what the research actually shows and whether it's right for you.

The evidence, ingredient by ingredient Nattokinase

How safe is it?

Well-documented data
Safety Information · database check
Well characterized

Adverse-effect, pregnancy, and general safety data are on file for most of these ingredients.

Why this rating?
  • We hold adverse-effect (side-effect) data for 1 of the 1 matched ingredient.
  • Pregnancy & breastfeeding safety ratings cover 1 of 1.
  • General safety write-ups exist for 1 of 1.
  • Remember: this measures how much safety information exists. Thin data is not the same as being safe.

Nattokinase is generally well tolerated in the short term, but its blood-thinning effect means you need to be cautious if you have any bleeding risk or bleeding disorder. Rare reports of bleeding—including a serious case of brain bleeding—have been linked to it, especially when combined with aspirin or other blood thinners.

There isn't enough safety data to know whether nattokinase is safe during pregnancy, so the data advises against it. Safety while breastfeeding is unknown, so it's best avoided.

Some people may have a hypersensitivity reaction to natto allergens found in nattokinase, with symptoms like throat tightness or swelling appearing within a couple of hours of taking it.

Side effects, ingredient by ingredient Nattokinase

Meds to double-check

Moderate interaction found
Known Interaction Concern · database check
Moderate identified

The most serious documented interaction for these ingredients is Moderate. Check your medications for a personalized result.

Why this rating?
  • 1 of the 1 matched ingredient can interact with medications — Nattokinase.
  • The most serious interaction on file is rated Moderate.
  • Some involve high-stakes drug classes: anticoagulant / antiplatelet drugs.
  • For scale: 289 individual medications appear in the full list. A big number alone doesn't make a product dangerous — what matters is whether YOUR medication is on it, so run yours through the interaction checker on this page.

Before taking this product, check with your doctor or pharmacist if you take blood thinners or antiplatelet drugs (like aspirin, warfarin, or clopidogrel)—nattokinase may increase bleeding risk. Also check if you're on blood pressure medications, as nattokinase may lower blood pressure further.

Check your own medication Run your meds through the checker above

The bottom line

Scorecard at a glanceFully disclosed formula with no established evidence rating for its marketed use. Moderate medication interactions have been identified, and safety information is well characterized.

Nattokinase might appeal to someone interested in blood flow support, but because it thins the blood, anyone taking blood thinners, antiplatelet drugs, or blood pressure medications needs to check with their doctor or pharmacist first. It's not recommended during pregnancy or breastfeeding.

Run your medication list through the checker on this page, and talk it over with your healthcare provider before you start.

Educational only — not medical advice; always confirm with your pharmacist. Our editorial policy · How we use AI

Assessment coverage: 1 of 1 active ingredient matched to our full ingredient reviews (monographs). Based on the product label dated Mar 23, 2018.

This Scorecard evaluates available label information, ingredient evidence, and known medication-safety considerations. It does not independently verify product identity, purity, potency, contamination, or manufacturing quality. How these ratings are computed

At a glance

General information

Key facts about Nattokinase 100 mg, straight from the product label.

Brand Seeking Health
Barcode (UPC) 828054134386
Net contents 60 Vegetarian Capsule(s)
Market status On market
Date entered into DSLD Mar 23, 2018
DSLD ID 174546
Product type Non-nutrient/non-botanical
Supplement form Capsule
Dietary claims / uses All Other
Intended target group(s) Adult (18 - 50 Years), Gluten Free, Dairy Free
From the label
Everything in this section is reproduced from the manufacturer’s own product label — it’s the label speaking, not HelloPharmacist. We show it so you can see exactly what the maker states; we don’t verify or endorse those statements.

Supplement Facts

The label details for Nattokinase 100 mg by Seeking Health, sourced from the NIH Dietary Supplement Label Database.

Supplement Facts

Daily Value (DV) Target Group(s):
Adults and children 4 or more years of age
Minimum serving Sizes:
1 Capsule(s)
Maximum serving Sizes:
1 Capsule(s)
Servings per container
60
UPC/BARCODE
828054134386
IngredientAmount% DV
Nattokinase NSK-SD100 mg--

Other ingredients: Vegetarian Capsule, L-Leucine, Cellulose, Silicon Dioxide

Tap any ingredient to jump to its full detail below.

Label statements
These statements are the manufacturer’s wording, reproduced from the product label — the label is saying it, not HelloPharmacist. We don’t verify or endorse them.
Suggested/Recommended/Usage/Directions

Suggested Use: 1 capsule twice daily, 12 hours apart, with or between meals or as directed by your health care professional. Use is contraindicated in persons with history of bleeding tendency.

Precautions

Use is contraindicated in persons with history of bleeding tendency. Do not use if shrinkwrap is broken or missing.

Keep out of reach of children.

Storage

Store in a cool, dry place (59(0)F-85(0)F) away from direct light or keep refrigerated.

General Statements

This product was made in a GMP and ISO 9001:2008 registered facility.

Physician formulated

Formula

Nattokinase 2,000 FU 100 mg

FDA Statement of Identity

Enzyme Supplement

Brand IP Statement(s)

NSK-SD is a registered trademark of Japan BioScience Laboratory, Co., Ltd.

Formulation

Does Not Contain: Milk/casein, eggs, fish, shellfish, tree nuts, peanuts, wheat/gluten, corn, and yeast. Contains no artificial colors, flavors, or preservatives.

Is this label outdated? Report a formula or label change and our pharmacy team will review it.

See for yourself

Nattokinase 100 mg by Seeking Health label

The label scan from the NIH Dietary Supplement Label Database. Tap to enlarge.

Nattokinase 100 mg label

Label images are published by the NIH Dietary Supplement Label Database for the version of this product on file. Always read your actual product label.

View the full label (PDF)
What’s inside

The Ingredients in Nattokinase 100 mg by Seeking Health

This is the 1 active ingredient this product is made of. Select it to open its full monograph.

Serving size1 Capsule(s) Dosage formCapsule Servings per container60 Amounts shown are per serving.

Nattokinase NSK-SD

Interacts with
289 drugs
100 mg per serving

Nattokinase is an enzyme from the fermented soybean food natto that may have mild blood-thinning and blood-flow effects. Some small studies hint at be...

Nattokinase NSK-SD monograph & interactions

Other (inactive) ingredients: Vegetarian Capsule, L-Leucine, Cellulose, Silicon Dioxide. These complete the product’s ingredient list but are not active constituents.

Interaction report

Nattokinase 100 mg by Seeking Health Drug Interactions

Want to check YOUR meds against Nattokinase 100 mg?

Ask about interactions with your drugs in plain English — “Can I take it with lisinopril?” — and we find you the answer in seconds, ingredient by ingredient.

 Go to the checker
289Drugs
289 Moderate

Ingredients driving the most interactions

Nattokinase NSK-SD 289

Individual Drug Interactions

The ingredients in Nattokinase 100 mg interact with 289 drugs. Click any drug to see the details.

1 of the 1 ingredient in Nattokinase 100 mg interact with drugs. Each result below shows which ingredient is responsible. Nattokinase NSK-SD

Each ingredient & the kinds of drugs it affects

For each ingredient in Nattokinase 100 mg with known interactions, here are the types of medications it can affect. Open any type for the detail — or search your exact drug in the checker above.

Nattokinase NSK-SD2 drug types · 289 drugs

Anticoagulant/Antiplatelet Drugs

Nattokinase might increase the risk of bleeding when used with anticoagulant/antiplatelet drugs.
Nattokinase has thrombolytic and anticoagulant effects. There is a case report of intracranial hemorrhage in a patient who added nattokinase to aspirin therapy.

Likelihood Possible Evidence D
Antihypertensive Drugs

Theoretically, nattokinase might increase the risk of hypotension when used with antihypertensive drugs.
Some clinical research suggests that nattokinase may reduce systolic and diastolic blood pressure.

Likelihood Possible Evidence D
Nattokinase NSK-SD full monograph & interactions
The maker

Brand information

Manufacturer and brand details for Nattokinase 100 mg, from the product label.

Seeking Health

See all Seeking Health products
Name
Seeking Health
Street Address
3140 Mercer Ave
City
Bellingham
State
WA
ZipCode
98225
Phone Number
(800) 547-9812
Web Address
www.seekinghealth.com
Pharmacist Counseling Corner

Nattokinase 100 mg by Seeking Health: Common Questions

Does Nattokinase 100 mg by Seeking Health interact with any medications?
Yes. Based on its ingredients, Nattokinase 100 mg has a known interaction with 289 medications. Use the checker to see how it interacts with a specific drug.
How can one product interact with so many drugs?
Nattokinase 100 mg contains a single active ingredient, and that one ingredient can interact with many different medications on its own. We check it against each medication and show the mechanism responsible.
Where does this information come from?
The product label data comes from the NIH Dietary Supplement Label Database (DSLD); the interaction data is built on the Natural Medicines database and reviewed by HelloPharmacist pharmacists.
Can I take nattokinase if I'm already on aspirin?
Not without talking to your doctor first. There's a documented case of serious brain bleeding in someone who took nattokinase with low-dose aspirin. Both thin the blood, and together they may increase your bleeding risk too much. Your doctor can tell you whether it's safe for your situation.
Will nattokinase lower my blood pressure?
Some research suggests it may reduce both systolic and diastolic blood pressure. If you already take blood pressure medication, adding nattokinase could lower it too much. Talk with your doctor before combining them.
Can I take nattokinase while pregnant or breastfeeding?
Not based on the safety data. There isn't enough information to know whether it's safe during pregnancy, so it's best avoided. Safety while breastfeeding is also unknown, so it's advised against. Talk with your doctor about what's right for you.
What is nattokinase, and where does it come from?
Nattokinase is an enzyme made from fermented soybeans (a Japanese food called natto). It's thought to work by breaking down blood clots and thinning the blood.
Are there any side effects I should know about?
Most people tolerate it well short-term. Rare cases of bleeding have been reported. A small number of people may have a hypersensitivity reaction to natto allergens, with symptoms like throat tightness showing up within a couple of hours of taking it.

Written and reviewed by the HelloPharmacist editorial staff. Our editorial policy

Not sure if Nattokinase 100 mg is safe with your meds?

Our pharmacists answer your medication & supplement questions — free.

Ask a pharmacist

Label information is sourced from the NIH Dietary Supplement Label Database and reflects the product version on file; always read your actual product label. This page is for education only and is not a substitute for professional medical advice. Confirm with your pharmacist or doctor before combining supplements and medications.

Nattokinase 100 mg label
Go deeper

The Full Monographs Behind Nattokinase 100 mg’s Ingredients

Every ingredient we hold a full HelloPharmacist monograph for — uses, evidence, safety, and the complete interaction list.

Herb & supplement monograph

Nattokinase

Interacts with 289 drugs

Nattokinase is an enzyme from the fermented soybean food natto that may have mild blood-thinning and blood-flow effects. Some small studies hint at benefits for blood pressure and circulatio...

Read the full Nattokinase monograph →
Sources

Sources & How We Checked

Nattokinase 100 mg's label data comes from the NIH Dietary Supplement Label Database; the ingredient interaction data is from the Natural Medicines database, reviewed by our pharmacists.

Content is written and reviewed by licensed HelloPharmacist pharmacists. See our data sources and editorial standards for how this information is built and checked.

The 9 references behind this product’s interaction data

Every citation that drives the interaction findings for this product’s ingredients, from the evidence-graded Natural Medicines (TRC Healthcare) database. Open an ingredient to browse its citations — links open the study on PubMed or the publisher’s site.

Nattokinase 9 references
  1. Suzuki Y, Kondo K, Matsumoto Y, et al. Dietary supplementation of fermented soybean, natto, suppresses intimal thickening and modulates the lysis of mural thrombi after endothelial injury in rat femoral artery. Life Sci 2003;73:1289-98.. PubMed
  2. Sumi H, Hamada H, Nakanishi K, Hiratani H. Enchancement of fibrinolytic activity in plasma by oral administration of nattokinase. Acta Haematol 1990;84:139-43.
  3. Chang, Y. Y., Liu, J. S., Lai, S. L., Wu, H. S., and Lan, M. Y. Cerebellar hemorrhage provoked by combined use of nattokinase and aspirin in a patient with cerebral microbleeds. Intern Med 2008;47(5):467-469. PubMed
  4. Kim, J. Y., Gum, S. N., Paik, J. K., Lim, H. H., Kim, K. C., Ogasawara, K., Inoue, K., Park, S., Jang, Y., and Lee, J. H. Effects of nattokinase on blood pressure: a randomized, controlled trial. Hypertens.Res 2008;31(8):1583-1588. PubMed
  5. <p>Maruyama M, Sumi H (eds): Effect of natto diet on blood pressure, in Basic and Clinical Aspects of Japanese Traditional Food Natto II. Japan Technology Transfer Association (JTTAS), 1998, pp 1–3.</p>
  6. Kurosawa Y, Nirengi S, Homma T, et al. A single-dose of oral nattokinase potentiates thrombolysis and anti-coagulation profiles. Sci Rep 2015;5:11601. PubMed
  7. Ramachandran L, Aqeel A, Jafri A, Sidhu Y, Mohamed Djirdeh T. Nattokinase-associated hemoperitoneum in an elderly woman. Cureus 2021;13(12):e20074. PubMed
  8. Awatani-Yoshidome K, Hashimoto T, Satoh T. Anaphylaxis from nattokinase in a patient with fermented soybean (natto) allergy. Allergol Int 2022;71(1):153-4. PubMed
  9. Suzuki K, Nakamura M, Sato N, Futamura K, Matsunaga K, Yagami A. Nattokinase, a subtilisin family serine protease, is a novel allergen contained in the traditional Japanese fermented food natto. Allergol Int 2022.

See these in context on the Nattokinase monograph →

Parts of this content are provided by the Therapeutic Research Center, LLC.

DISCLAIMER: Currently this does not check for drug-drug interactions. This is not an all-inclusive comprehensive list of potential interactions and is for informational purposes only. Not all interactions are known or well-reported in the scientific literature, and new interactions are continually being reported. Input is needed from a qualified healthcare provider including a pharmacist before starting any therapy. Application of clinical judgment is necessary.

© 2021 Therapeutic Research Center, LLC

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