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Dietary supplement

Nattokinase Ingredients & Drug Interactions

by Nutricrafters

Nattokinase 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 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 Nutricrafters 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 Nutricrafters

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

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HelloPharmacist Scorecard of Nattokinase by Nutricrafters

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.

This product contains one active ingredient: nattokinase, an enzyme derived from natto (fermented soy). Nattokinase is what gives the product its intended action — it's designed to work on blood clotting and flow.

The capsule also contains several inactive ingredients — microcrystalline cellulose, cellulose, and ascorbyl palmitate — which are fillers and binders that hold the supplement together.

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: supports healthy blood flow and circulation.
  • 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 we hold for nattokinase doesn't establish that it works for any of the conditions it's marketed for — angina, atherosclerosis, cancer, cardiovascular disease, or chronic fatigue syndrome all have insufficient reliable evidence to rate its effectiveness. That doesn't mean it's ineffective, just that solid clinical proof isn't yet on file in our data.

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 — including people taking blood thinners or with clotting disorders. Rare cases of serious bleeding, including brain hemorrhage, have been reported.

Some people may also have a hypersensitivity reaction to nattokinase or other compounds in natto, with symptoms like throat or airway swelling occurring within a couple of hours of taking it. The safety data advises against nattokinase during pregnancy and breastfeeding.

There isn't enough information to know whether it's safe for either, so talk with your doctor or pharmacist for personalized advice if you're pregnant, planning pregnancy, or nursing.

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 with us before taking nattokinase if you're on blood thinners or antiplatelet drugs (like warfarin, dabigatran, apixaban, or aspirin) — the bleeding risk is Moderate and documented. Also double-check if you take high blood pressure medications, since 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 is worth a conversation with your pharmacist if you're interested in it — especially if you're taking any blood thinner, antiplatelet drug, or blood pressure medication. The evidence for what it actually does isn't established yet, so know what you're signing up for.

If you have a bleeding disorder or a history of blood clots, definitely check with us first.

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 Jul 24, 2025.

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 Nutricrafters
Net contents 60 Vegetarian Capsule(s)
Market status On market
Date entered into DSLD Jul 24, 2025
DSLD ID 334610
Product type Non-nutrient/non-botanical
Supplement form Capsule
Dietary claims / uses All Other, Structure/Function
Intended target group(s) Adult (18 - 50 Years), Women (not pregnant or lactating)
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 Nutricrafters, 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:
3 Capsule(s)
Servings per container
60
IngredientAmount% DV
Nattokinase100 mg--

Other ingredients: Microcrystalline Cellulose, Cellulose, Ascorbyl Palmitate

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.
Formula

Nattokinase supports healthy blood flow and circulation. Nattokinase is an enzyme extracted from Natto, a cheese-like food made from fermented soybeans. Nattokinase may contribute to the function of the heart and cardiovascular system by enhancing fibrinolytic activity.

Nattokinase NSK-SD 100 mg -2,000 units

FDA Disclaimer Statement

This statement has not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.

Precautions

Caution: Keep out of reach of children.

Use only as directed. People with ulcers, recent or pending surgery, or recent major trauma should not take Nattokinase.

Not for use by pregnant or lactating women. Generally, people with bleeding disorders, or taking prescription blood thinners, should use this product only under the close supervision of a medical doctor.

Contains soy.

This product should be used within 2 years of purchase. Safety-sealed for your protection. Return for replacement if the outer seal is broken.

Brand IP Statement(s)

NSK-SD TM is a registered trademark of Japan Bio Science Laboratories.

Formulation

Supports healthy circulation

FDA Statement of Identity

A Dietary Supplement

Suggested/Recommended/Usage/Directions

Suggested use: Take 1-3 capsules per day.

Storage

Store in a cool, dark, dry place.

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

See for yourself

Nattokinase by Nutricrafters 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 Nutricrafters

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
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 monograph & interactions

Other (inactive) ingredients: Microcrystalline Cellulose, Cellulose, Ascorbyl Palmitate. These complete the product’s ingredient list but are not active constituents.

Interaction report

Nattokinase by Nutricrafters 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.

Nutricrafters

See all Nutricrafters products
Name
NutriCrafters LLC
City
Sparks
State
NV
ZipCode
89431
Phone Number
800-240-8109
Web Address
www.nutricrafters.com
Pharmacist Counseling Corner

Nattokinase by Nutricrafters: Common Questions

Does Nattokinase by Nutricrafters 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.
Is nattokinase safe if I'm on aspirin?
No — there's a documented case of serious brain bleeding in someone who took nattokinase while on low-dose aspirin. Both drugs thin the blood, so together they raise your bleeding risk significantly. Talk to your pharmacist or doctor before combining them.
Can I take nattokinase while pregnant or breastfeeding?
The safety data advises against it in pregnancy, and there isn't enough information to know whether it's safe while breastfeeding. Talk with your doctor or pharmacist about your specific situation before taking it.
Does nattokinase actually work for heart disease?
The evidence we have doesn't establish that it does. We don't have reliable clinical proof that it works for angina, atherosclerosis, cardiovascular disease, or the other conditions it's marketed for.
What if I'm allergic to soy or natto?
Nattokinase comes from natto, fermented soy, and some people have had allergic reactions to it — including severe ones like throat swelling. If you have a soy allergy or know you react to natto, avoid this product.
What are the inactive ingredients in this product?
The capsule contains microcrystalline cellulose, cellulose, and ascorbyl palmitate — all fillers or binders that hold the supplement together.

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

Not sure if Nattokinase 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 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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