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Dietary supplement

NattoKinase Ingredients & Drug Interactions

by XYMOGEN

NattoKinase label
See full label image
Capsule Category: Non-nutrient/non-botanical
Most serious interaction: Moderate
Clinical methodology reviewed by · Updated Oct 7, 2026 · Label data from the NIH DSLD
What is this page for?

First and foremost: checking NattoKinase 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 is a dietary supplement by XYMOGEN 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. 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 by XYMOGEN

Ask about any prescription or over-the-counter medication and we check it for interactions with NattoKinase by XYMOGEN — and tell you which ingredient is responsible.

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HelloPharmacist Scorecard of NattoKinase by XYMOGEN

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 Jul 11, 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 by XYMOGEN contains one active ingredient: nattokinase, an enzyme sourced from fermented soy. It also contains three inactive ingredients — a vegetarian capsule, rice flour, and magnesium stearate — which are standard fillers and binders.

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: Angina, Atherosclerosis, Cardiovascular disease (CVD), Hyperlipidemia, Hypertension, Peripheral arterial disease (PAD) — and 4 related terms.
  • The closest evidence on file: Nattokinase is rated "Insufficient Reliable Evidence To Rate" for Angina (Natural Medicines).
  • Also on file: Nattokinase is rated "Insufficient Reliable Evidence To Rate" for Atherosclerosis, Cardiovascular disease (CVD), Hyperlipidemia, Hypertension, and more.

The evidence for nattokinase's effectiveness isn't established in the data we hold. The ingredient has been studied for angina, atherosclerosis, cancer, cardiovascular disease, and chronic fatigue, but each shows insufficient reliable evidence to rate it.

If you're considering this product for a specific health goal, talk with your pharmacist about what the current research actually supports.

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 careful if you have any bleeding risk. Rare cases of serious bleeding, including brain hemorrhage, have been reported — especially when combined with aspirin or other blood thinners.

Some people may also have a hypersensitivity reaction to nattokinase or to natto (fermented soy); symptoms like throat or larynx swelling can appear within 2 hours of taking it. There isn't enough safety data to know whether nattokinase is safe in pregnancy or while breastfeeding, so avoid it during those times and talk with your doctor or pharmacist.

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.

Check your blood thinners and antiplatelet drugs first — aspirin, warfarin, clopidogrel, and others. Also review any blood pressure medications you take.

Both interactions are rated Moderate severity. Use the medication checker on this page with your full list before you begin.

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 is worth considering only if you've checked it against your medications — especially blood thinners and blood pressure drugs. If you have any bleeding risk or natto/soy sensitivity, steer clear.

Talk to your pharmacist 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 Feb 23, 2012.

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, straight from the product label.

Brand XYMOGEN
Net contents 60 Vegetable Capsule(s)
Market status On market
Date entered into DSLD Feb 23, 2012
DSLD ID 5932
Product type Non-nutrient/non-botanical
Supplement form Capsule
Dietary claims / uses All Other, Structure/Function
Intended target group(s) Vegetarian, 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 by XYMOGEN, 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
IngredientAmount% DV
NattoKinase50 mg--

Other ingredients: Vegetarian Capsule, Rice Flour, Magnesium Stearate

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.
FDA Statement of Identity

Dietary Supplement

Suggested/Recommended/Usage/Directions

Directions: Take one capsule during the day and one capsule at bedtime or as directed by your healthcare practitioner.

Precautions

Keep out of reach of children.

Avoid if allergic to soy.

CONTAINS: Soy.

• Pharmaceutical Grade • Professional Use Only

CAUTION: Consult your healthcare practitioner before use.

FDA Disclaimer Statement

*These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure or prevent any disease.

Storage

STORAGE: Keep tightly closed in a cool, dry place.

General Statements

High Potency Patented, Fibrinolytic Enzyme

NattoKinase is an all-natural, potent fibrinolytic enzyme that is extracted and highly purified from natto, a fermented soybean food consumed in Japan for over 1000 years. It is fast-acting and long-lasting.

This package is completely recyclable (recycle)

In 1980, researchers discovered that NattoKinase could successfully break down fibrin, a blood clotting protein. NattoKinase has been the subject of many studies, including human and animal trials. NattoKinase may support the body in areas such as cardiovascular-related disorders, vascular and circulatory disorders and may aid in conditions of poor healing.*

EXCLUSIVE PROFESSIONAL FORMULAS

Brand IP Statement(s)

(C) XYMOGEN 2010

All XYMOGEN(R) Formulas Meet or Exceed cGMP Quality Standards.

NattoKinase (NSK-SD(R)) is the highest activity (20,000 fibrin units per gram) nattokinase produced U.S. patented manufacturing process. Patent Application No. 20010046697 removes Vitamin K to prevent adverse interaction with warfarin.

Formulation

DOES NOT CONTAIN: Wheat, gluten, corn protein, yeast, dairy products, artificial colors, sweeteners or preservatives.

Seals/Symbols

VEGETABLE CAPSULES

General

REV. 072210

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

See for yourself

NattoKinase by XYMOGEN label

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

NattoKinase 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 by XYMOGEN

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

Interacts with
289 drugs
50 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 monograph & interactions

Other (inactive) ingredients: Vegetarian Capsule, Rice Flour, Magnesium Stearate. These complete the product’s ingredient list but are not active constituents.

Interaction report

NattoKinase by XYMOGEN Drug Interactions

Want to check YOUR meds against NattoKinase?

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 289

Individual Drug Interactions

The ingredients in NattoKinase interact with 289 drugs. Click any drug to see the details.

1 of the 1 ingredient in NattoKinase interact with drugs. Each result below shows which ingredient is responsible. NattoKinase

Each ingredient & the kinds of drugs it affects

For each ingredient in NattoKinase 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.

NattoKinase2 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 full monograph & interactions
The maker

Brand information

Manufacturer and brand details for NattoKinase, from the product label.

XYMOGEN

See all XYMOGEN products
Name
XYMOGEN Exclusive Professional Formulas
Street Address
725 S. Kirkman Rd.
City
Orlando
State
FL
ZipCode
32811
Phone Number
800-647-6100
Web Address
www.xymogen.com
Pharmacist Counseling Corner

NattoKinase by XYMOGEN: Common Questions

Does NattoKinase by XYMOGEN interact with any medications?
Yes. Based on its ingredients, NattoKinase 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 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.
What is nattokinase and where does it come from?
Nattokinase is an enzyme that comes from natto, a traditional Japanese fermented soy food. It works by helping to thin the blood and break down clots.
Can I take NattoKinase if I'm already on aspirin or another blood thinner?
No — not without talking to your pharmacist or doctor first. Nattokinase thins blood on its own, and adding it to a blood thinner significantly raises your risk of bleeding. There's even a documented case of brain bleeding when someone combined nattokinase with low-dose aspirin.
Is it safe to take during pregnancy or while breastfeeding?
No. There isn't enough safety data to know whether nattokinase is safe in pregnancy, and safety while breastfeeding is unknown, so both should be avoided. Talk with your doctor or pharmacist for personalized advice if you're pregnant or nursing.
Can nattokinase cause allergic reactions?
Yes — if you're sensitive to natto or soy, you could have a hypersensitivity reaction. Symptoms like throat or larynx swelling can appear within 2 hours of taking it, and in rare cases anaphylaxis can occur.
Does it work for heart disease or blood vessel problems?
The evidence isn't established. Nattokinase has been studied for conditions like angina, atherosclerosis, and cardiovascular disease, but we don't have reliable data showing it works for these yet.

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

Not sure if NattoKinase is safe with your meds?

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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 label
Go deeper

The Full Monographs Behind NattoKinase’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'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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