Can you take turmeric and nattokinase at the same time?

Both turmeric and nattokinase are marketed for healthy circulation, so pairing them sounds logical — until you notice both are also described as natural blood thinners.

That overlap is the entire question. Turmeric's active compound, curcumin, shows antiplatelet activity in laboratory studies [5], while nattokinase enhances the body's clot-breakdown system at doses around 2,000 FU per day [1]. For most healthy adults the combination is generally low-risk — but for anyone on blood thinners or facing surgery, the answer changes.

Table of Contents

• 1. The Short Answer: Can You Take Them Together?
• 2. How Each One Affects Your Blood
• 3. The Real Concern: Additive Bleeding Risk
• 4. Who Should Not Combine Turmeric and Nattokinase
• 5. How to Take Turmeric and Nattokinase Together Safely
• 6. Turmeric's Separate Safety Consideration: Your Liver
• 7. Why a K2-Free, Standardized Nattokinase Makes Stacking Simpler
• Frequently Asked Questions
• Conclusion
• Research References

1. The Short Answer: Can You Take Them Together?

For a healthy adult who is not taking blood-thinning medication, has no bleeding disorder, and is not about to have surgery, taking turmeric and nattokinase at the same time is generally considered low-risk — but "low-risk" is not the same as "no-risk." Both act on the same system: clotting. Nattokinase has been studied mostly at 100 mg (2,000 FU) per day and was well tolerated with no adverse events [3] in an 8-week North American trial of 79 people. If you are new to the enzyme itself, our complete guide to nattokinase covers the basics first.

The honest limitation is that almost no controlled research has tested this specific pair together. What we have is strong evidence that each one is a mild blood thinner on its own, plus mechanistic logic that their effects can stack. That is enough to warrant thought — especially for the many readers who take at least one other supplement or medication that also affects bleeding.

So the practical answer has two branches: if you are healthy and medication-free, proceed carefully and start with one at a time; if you take any blood thinner or have a clotting condition, treat the combination as something to clear with your doctor first — the same caution BioAbsorb applies across its nattokinase blood-thinner guidance.

2. How Each One Affects Your Blood

Nattokinase and curcumin thin the blood through different doors, which is exactly why their effects can add up. Nattokinase is a fibrinolytic enzyme — it helps break down fibrin, the protein mesh that holds clots together. In a clinical review, even a single 2,000 FU dose significantly raised fibrin-degradation-product levels within 4 hours [7], confirming a measurable boost to clot breakdown.

Curcumin works earlier in the process, on platelets. Laboratory and animal studies show it inhibits platelet aggregation and reduces activation markers [5] such as P-selectin, and separate work found curcumin prolongs standard clotting-time measures (aPTT and PT) [4] in the lab. One is anti-clot-formation; the other is pro-clot-breakdown.

It is worth keeping the magnitudes in perspective. Nattokinase's blood-pressure and clotting effects are modest and consistent — a 2023 meta-analysis of 6 trials and 546 participants found it lowered diastolic pressure by about 2.32 mmHg [2]. Curcumin's anticoagulant activity is strongest in test tubes and less pronounced in the body, largely because it is poorly absorbed.

3. The Real Concern: Additive Bleeding Risk

The central question with any two blood-thinning agents is whether their effects compound, and here the evidence is real but limited. Memorial Sloan Kettering states that nattokinase may theoretically increase bleeding risk [8] when used with anticoagulant, antiplatelet, or fibrinolytic agents — and turmeric's curcumin behaves like a mild version of exactly those.

Real-world signals exist for nattokinase specifically. The same MSK review documents case reports including a cerebellar hemorrhage and, in an elderly woman taking over-the-counter nattokinase with no other blood thinner, fatal internal bleeding [8]. In one unpublished study, 12 hospitalized stroke patients already on heparin plus aspirin or clopidogrel who added 6,000 FU of nattokinase daily for 7 days showed increased bleeding and clotting times [9].

Turmeric offers one reassuring counterweight worth stating plainly. A 10-day clinical study of a bioavailable curcumin formulation in patients on warfarin or antiplatelet drugs found no significant change in INR or antiplatelet activity [6]. So the additive risk is plausible and worth respecting, but at typical culinary-to-moderate turmeric doses it appears smaller than headlines suggest — the caution scales up sharply once prescription blood thinners enter the picture.

4. Who Should Not Combine Turmeric and Nattokinase

Some readers should not pair these two without a doctor's explicit sign-off. The clearest group is anyone on anticoagulant or antiplatelet medication — warfarin, apixaban, rivaroxaban, dabigatran, aspirin, or clopidogrel. MSK advises that people undergoing anticoagulant or antithrombotic treatment should avoid nattokinase [8] entirely; adding curcumin on top only widens that concern.

Three more groups warrant the same caution: people with bleeding or clotting disorders; anyone who is pregnant or nursing, where safety data are thin; and anyone with upcoming surgery or a dental procedure. On that last point, the American Society of Anesthesiologists recommends discontinuing herbal supplements 1 to 2 weeks before surgery [15].

There is also a documented disclosure gap: reviews estimate that 50 to 70% of surgical patients never tell their clinicians about herbal supplement use [14]. If you take turmeric and nattokinase, put both on your medication list — a supplement that thins your blood is medically relevant even if it came from the vitamin aisle.

5. How to Take Turmeric and Nattokinase Together Safely

If you have cleared the safety checks above, a few practical habits reduce risk. Start with one supplement at a time — introduce nattokinase at the standard 2,000 FU dose studied in an 86-person trial [1], hold for a couple of weeks, then add turmeric — so that if anything changes, you know which one caused it. Our nattokinase dosage guide covers the full range in more detail. Watch for easy bruising, nosebleeds, bleeding gums, or blood in urine or stool, and stop if they appear.

Timing can optimize each one, though it is important to be honest about what timing does and doesn't do. Nattokinase is typically taken on an empty stomach, while curcumin absorbs better with a fatty meal and a pinch of black pepper — so taking nattokinase in the morning and turmeric with dinner suits both. Spacing improves absorption; it does not neutralize the fact that both effects circulate systemically, so it is not a workaround for the bleeding question.

Product quality matters more than most people expect here. Raw natto is high in vitamin K2, which can reduce warfarin's INR if it is not removed during manufacturing [9]. BioAbsorb's nattokinase is intentionally formulated without vitamin K2 and standardized to 2,000 FU activity, which removes one variable from an already nuanced conversation.

6. Turmeric's Separate Safety Consideration: Your Liver

Bleeding risk is not turmeric's only caveat, and this one is easy to miss because it has nothing to do with nattokinase. The National Center for Complementary and Integrative Health notes that conventional turmeric is likely safe for up to 2 to 3 months, but that highly bioavailable formulations have been linked to liver damage [10] in some people.

This is a growing signal, not a fringe worry. The NIH's LiverTox database reports that turmeric supplements have been implicated in several dozen cases of clinically apparent acute liver injury [11], and hepatologists estimate that roughly 20% of drug-induced liver injuries in the U.S. involve herbal and dietary supplements [13]. Genetics play a role, so the same product affects people differently.

The practical guidance is moderation. Northwestern Medicine notes curcumin is generally safe up to about 8 grams a day [12], but far lower everyday doses are sensible, and the added piperine that boosts absorption also raises exposure. If you notice fatigue, nausea, dark urine, or yellowing skin, stop and see a clinician.

7. Why a K2-Free, Standardized Nattokinase Makes Stacking Simpler

When you are combining supplements that touch clotting, predictability is the feature that matters most — you want to know exactly what you are taking. BioAbsorb Nutraceuticals extracts its nattokinase from non-GMO soybeans fermented with Bacillus subtilis, and each capsule delivers 100 mg standardized to 2,000 FU — the same dose used in the trials described above [1][3].

Two formulation choices are especially relevant to anyone stacking turmeric alongside it. First, vitamin K2 is deliberately removed, which sidesteps the natto-versus-warfarin interference that can complicate blood-thinner conversations. Second, the enzyme is delivered in a DRcaps delayed-release veggie capsule that protects it from stomach acid without the phthalates and plasticizers found in some enteric coatings.

The pack is a 60-day supply — one capsule daily on an empty stomach. It is non-GMO, free of gluten, dairy, nuts, eggs, fish, and shellfish, and contains no animal products. None of that overrides the medical caution in this article; it simply removes the avoidable variables so the only question left is the one your doctor can help you answer.

Frequently Asked Questions

Is it safe to take turmeric and nattokinase on the same day?

For a healthy adult not on blood thinners, taking both on the same day is generally considered low-risk, and separating them by meal (nattokinase on an empty stomach, turmeric with food) suits each one's absorption. The caveat is that both are mild blood thinners, so watch for easy bruising or bleeding, and clear it with your doctor if you take any medication that affects clotting.

Can I take turmeric and nattokinase if I'm on a blood thinner?

Not without medical supervision. Memorial Sloan Kettering advises that people on anticoagulant or antiplatelet therapy avoid nattokinase [8], and curcumin adds mild antiplatelet activity of its own [5]. The additive effect can push bleeding risk higher than your prescribed regimen accounts for, so this is a conversation to have with your prescriber before combining anything.

How long before surgery should I stop both?

The American Society of Anesthesiologists recommends stopping herbal supplements 1 to 2 weeks before elective surgery [15]. Because both turmeric and nattokinase affect clotting, both belong on that stop list — and both belong on the medication list you give your surgical team.

Does taking them at different times of day reduce the risk?

Spacing helps each supplement absorb better, but it does not eliminate the additive bleeding effect. Once absorbed, nattokinase and curcumin act throughout your circulation regardless of when you took them, so timing is about optimizing benefit, not about making an unsafe combination safe.

Which is the stronger blood thinner, turmeric or nattokinase?

Nattokinase has more direct human evidence for measurable effects on clotting, including raised fibrin-degradation products after a single 2,000 FU dose [7]. Curcumin's anticoagulant activity is most pronounced in laboratory settings and is limited in the body by its poor absorption, though bioavailability-enhanced formulations narrow that gap and warrant more caution.

Can I just eat turmeric in food instead of taking a supplement?

Culinary turmeric provides very little curcumin and is unlikely to add meaningfully to nattokinase's blood-thinning effect, which is why dietary turmeric rarely raises the same concern as concentrated capsules. The World Health Organization's referenced intake works out to roughly 200 mg of turmeric daily for a 150-pound adult [13] — a threshold cooking almost never approaches but supplements easily exceed.

Conclusion

For most healthy adults, taking turmeric and nattokinase together is generally low-risk when you start with one at a time, keep doses modest, and stay alert for bleeding signs — but for anyone on blood thinners, with a clotting condition, or facing surgery, it is a decision to make with a clinician, not alone. Choosing a clean, K2-free, standardized enzyme removes the avoidable variables from that decision. Explore BioAbsorb's Nattokinase Enzyme to see how it is formulated.

Research References

1. Effects of Nattokinase on Blood Pressure: A Randomized, Controlled Trial. Hypertension Research, Vol. 31 (2008). Randomized, double-blind, placebo-controlled trial in 86 participants showing that 2,000 FU of nattokinase daily for 8 weeks significantly reduced systolic blood pressure.
2. Nattokinase Supplementation and Cardiovascular Risk Factors: A Systematic Review and Meta-Analysis of Randomized Controlled Trials. Reviews in Cardiovascular Medicine (2023). Pooled analysis of 6 trials and 546 participants finding significant reductions in systolic and diastolic blood pressure (diastolic MD -2.32 mmHg).
3. Consumption of nattokinase is associated with reduced blood pressure and von Willebrand factor: a North American clinical trial. Integrated Blood Pressure Control (2016). 8-week trial of 79 participants using vitamin-K2-removed nattokinase (100 mg/2,000 FU daily); product was well tolerated with no associated adverse events.
4. Curcumin, hemostasis, thrombosis, and coagulation. Journal of Cellular Physiology (2018). Review documenting curcumin's antiplatelet and anticoagulant activity, including prolongation of aPTT and PT in laboratory measures.
5. Regulatory Effects of Curcumin on Platelets: An Update and Future Directions. Biomedicines, Vol. 10(12), 3180 (2022). Review describing curcumin's inhibition of platelet aggregation and activation markers such as P-selectin and GPIIb/IIIa.
6. Interaction study between antiplatelet agents, anticoagulants, thyroid replacement therapy and a bioavailable formulation of curcumin (Meriva). European Review for Medical and Pharmacological Sciences (2018). Clinical study finding that 10 days of a bioavailable curcumin formulation did not significantly alter INR or antiplatelet activity in patients on warfarin, dabigatran, or antiplatelet drugs.
7. Nattokinase: A Promising Alternative in Prevention and Treatment of Cardiovascular Diseases. Biomarker Insights, Vol. 13 (2018). Review reporting that a single 2,000 FU oral dose of nattokinase significantly increased fibrin-degradation products within 4 hours.
8. Nattokinase - Integrative Medicine Herb Monograph. Memorial Sloan Kettering Cancer Center (2024). Clinical resource noting theoretical increased bleeding risk with anticoagulant, antiplatelet, and fibrinolytic drugs, and documenting case reports of serious bleeding and mechanical-valve thrombosis.
9. Nattokinase - Professional Monograph. Drugs.com Natural Products Database. Summarizes fibrinolytic and antiplatelet activity, the vitamin-K2/warfarin interaction, and an unpublished study in which 12 patients on heparin plus antiplatelet drugs and 6,000 FU nattokinase showed increased bleeding time.
10. Turmeric: Usefulness and Safety. National Center for Complementary and Integrative Health (NIH). States conventional turmeric is likely safe for up to 2-3 months and warns that highly bioavailable formulations have been linked to liver damage.
11. Turmeric. LiverTox, National Institute of Diabetes and Digestive and Kidney Diseases (NIH). Reports that turmeric supplements have been implicated in several dozen cases of clinically apparent acute liver injury.
12. Are Turmeric and Curcumin Supplements Safe for Your Liver? Northwestern Medicine. Notes curcumin is generally safe up to about 8 g/day, that piperine increases absorption, and that people on blood thinners may be more prone to liver problems.
13. Supplements That Can Damage Your Liver. Yale New Haven Health. Reports that roughly 20% of U.S. drug-induced liver injuries involve herbal and dietary supplements and cites WHO-referenced turmeric intake limits.
14. Use of herbal medication in the perioperative period: potential adverse drug interactions. [journal details not confirmed] (2024). Review noting ASA/AANA guidance to stop herbal medications 1-2 weeks before elective surgery and that 50-70% of surgical patients do not disclose herbal use.
15. Stop Taking Herbal Medicines 1 to 2 Weeks Before Surgery. Institute for Safe Medication Practices / American Society of Anesthesiologists. Recommends discontinuing herbal supplements 1-2 weeks before surgery to reduce bleeding and anesthesia-interaction risk.

About the Author

David Kimbell is a health writer, digital entrepreneur and former aerospace engineer, based in Ottawa, Canada. He loves translating complex science into clear, actionable guidance for consumers seeking evidence-based solutions.

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Important Disclaimers

Medical Disclaimer: This article provides educational information only and is not intended as medical advice. Always consult with a qualified healthcare provider before starting any new supplement, especially if you have existing health conditions, take medications, or are pregnant or nursing.

FDA/Health Canada Statement: These statements have not been evaluated by the Food and Drug Administration or Health Canada. This product is not intended to diagnose, treat, cure, or prevent any disease.