Can I Take Magnesium and Nattokinase Together? 

Magnesium and nattokinase can be taken together safely — but understanding why matters as much as knowing whether they can.

Approximately 45% of Americans are magnesium deficient, and interest in nattokinase — the fibrinolytic enzyme derived from fermented soy — has grown steadily among those seeking evidence-based cardiovascular support. Both supplements work on the heart and circulation, but through different pathways. That distinction is key to understanding why combining them is generally safe and potentially beneficial.

This article covers what each supplement does, whether there are known interactions, practical timing guidance, and the specific situations that require extra caution.

Table of Contents

1. What Magnesium and Nattokinase Each Do
2. Do They Interact? What the Evidence Shows
3. The Cardiovascular Overlap: Complementary, Not Redundant
4. Practical Protocol: How to Take Both Effectively
5. Who Should Exercise Caution
6. BioAbsorb Nattokinase: Delayed-Release Delivery for the Cardiovascular Stack
7. Frequently Asked Questions
8. Conclusion
9. Research References

1. What Magnesium and Nattokinase Each Do

Nattokinase is a serine protease enzyme derived from natto, the fermented Japanese soybean food. Discovered in 1987, it acts on the body's clotting cascade through a process called fibrinolysis — breaking down fibrin, the structural protein of blood clots. What makes nattokinase distinctive is that it doesn't simply dissolve fibrin directly; it also inactivates plasminogen activator inhibitor-1 (PAI-1) and enhances tissue plasminogen activator (tPA), effectively amplifying the body's own clot-clearing system. The enzyme is standardized in fibrinolytic units (FU), with the clinically studied dose in blood pressure and fibrinolysis trials typically set at 2,000 FU per day. For a deeper look at the mechanism, our complete guide to what nattokinase is and how it works covers the full evidence base.

Magnesium operates at a fundamentally different level. It functions as a cofactor in more than 300 enzyme systems, including those governing muscle and nerve function, blood glucose regulation, and blood pressure control. In the cardiovascular system specifically, magnesium supports vascular smooth muscle relaxation, influences calcium channel activity, and plays a role in maintaining normal heart rhythm. Its RDA ranges from 310 to 420 mg/day for adults depending on age and sex — a threshold more than half the US population consistently fails to reach.

The key distinction is where in the cardiovascular system each supplement acts. Nattokinase works downstream, at the level of fibrin and clotting dynamics. Magnesium works upstream, at the level of vascular tone and cellular signalling. For people managing blood pressure or circulatory health, this means the two supplements are potentially complementary rather than redundant — they don't duplicate each other's effects.

2. Do They Interact? What the Evidence Shows

No published clinical studies have examined the direct combination of magnesium and nattokinase. That absence itself is meaningful — neither the research community nor pharmacovigilance systems have flagged this combination as a concern worth investigating. The more useful question is whether the two supplements share mechanisms that could compound in an unwanted way. At standard supplemental doses, the answer is generally no.

Nattokinase does have mild antiplatelet properties in addition to its fibrinolytic activity. Research shows it inhibits thromboxane B2 formation, which plays a role in platelet aggregation. Magnesium, at supraphysiological concentrations, has also shown dose-dependent inhibition of platelet aggregation in in vitro platelet studies. However, the platelet effect of magnesium at typical supplemental doses of 200–400 mg of elemental magnesium is not clinically significant for most healthy adults. Restoring magnesium to physiological levels is qualitatively different from administering pharmacological doses.

The two supplements do not interact pharmacokinetically: magnesium does not alter how nattokinase is absorbed, distributed, or broken down in the body, and nattokinase does not affect magnesium metabolism. Across six randomized controlled trials involving 546 participants, nattokinase supplementation produced no notable adverse events. The safety profile of magnesium at standard doses is similarly well-established. For healthy adults not on blood-thinning medications, combining the two at standard doses carries no known risks.

3. The Cardiovascular Overlap: Complementary, Not Redundant

Blood pressure is where the overlap between magnesium and nattokinase is most visible — and where the case for combining them is clearest. Magnesium exerts its blood pressure effects primarily through vascular smooth muscle relaxation and renal mechanisms. A 2025 systematic review published in Hypertension covering 38 randomized controlled trials and 2,709 participants found magnesium supplementation reduced systolic blood pressure by 2.81 mmHg and diastolic by 2.05 mmHg on average. The reductions were more pronounced in people with diagnosed hypertension and low baseline magnesium levels.

Nattokinase contributes through a different mechanism entirely. In a randomized double-blind placebo-controlled trial conducted across multiple North American sites, 74 participants with elevated blood pressure consuming 100 mg/2,000 FU of nattokinase daily for 8 weeks saw average diastolic blood pressure drop from 87 to 84 mmHg — statistically significant against the placebo group, where diastolic BP remained constant at 87 mmHg. Male participants saw an even larger reduction, from 86 to 81 mmHg. The nattokinase group also showed a decrease in von Willebrand factor (vWF), a cardiovascular risk marker associated with clotting tendency and ischemic stroke risk.

The broader cardiovascular picture reinforces the complementary framing. A 14,232-person cohort study followed over 12 years found that individuals in the highest quartile of serum magnesium had a 38% lower risk of sudden cardiac death compared to those in the lowest quartile. Nattokinase's contribution targets fibrin clearance, platelet dynamics, and vascular renin activity — a different layer of the same cardiovascular system. Together, the two supplements address upstream vascular tone and downstream fibrin management through non-overlapping pathways.

4. Practical Protocol: How to Take Both Effectively

Nattokinase is best taken on an empty stomach, away from meals. The enzyme can be degraded by stomach acid and digestive enzymes when consumed alongside food, which is one reason most clinical protocols use a fasted morning dose. Supplements using DRcaps delayed-release capsule technology — like BioAbsorb's formulation — provide additional acid protection, allowing the enzyme to transit intact to the small intestine. The standard clinical protocol used in blood pressure trials is 1 capsule (100 mg/2,000 FU) once daily on an empty stomach. For more detail on dose ranges and timing considerations, the full nattokinase dosage guide covers the published trial data across dose levels.

Magnesium, by contrast, is often better tolerated with food. Some forms — particularly magnesium oxide and magnesium citrate at higher doses — can cause loose stools on an empty stomach. The most commonly used doses in blood pressure trials ranged from 200 to 637 mg of elemental magnesium, with a median of 365 mg/day. The NIH sets the tolerable upper intake level for supplemental magnesium at 350 mg/day for adults — the level above which laxative effects become likely. Most people supplement well within this range.

There is no need to separate the two supplements by a specific interval. Magnesium and nattokinase are processed by completely independent metabolic pathways, and neither affects the absorption of the other. A practical schedule that many people find convenient: nattokinase in the morning before breakfast, magnesium in the evening with dinner or before bed. Some forms of magnesium — particularly glycinate and malate — are noted for their calming properties, making evening use a natural fit.

5. Who Should Exercise Caution

For most healthy adults not on prescription medications, combining nattokinase and magnesium at standard doses is low-risk. However, several groups need physician oversight before starting either supplement:

• Anyone on anticoagulants or antiplatelet medications — warfarin, apixaban, rivaroxaban, clopidogrel, or daily aspirin. Nattokinase has fibrinolytic and mild antiplatelet activity; combining it with a blood-thinning medication creates a real bleeding risk that requires medical monitoring. Clinical trials on nattokinase have consistently excluded participants on anticoagulant therapy. For a full review of nattokinase's safety profile, nattokinase side effects and safety considerations goes into detail on contraindications.
• People with kidney disease — the kidneys regulate magnesium excretion; in people with reduced kidney function, supplemental magnesium can accumulate to unsafe levels. Consult a nephrologist or primary care physician before supplementing.
• Anyone with a scheduled surgery within 2 weeks — nattokinase should be discontinued before any surgical procedure due to its effect on clotting dynamics. Discuss the timeline with your surgeon.
• Those with bleeding disorders — conditions such as haemophilia or von Willebrand disease are contraindications to nattokinase use without direct physician supervision.
• Pregnancy and nursing — there is insufficient evidence to establish safety for either supplement at supplemental doses during pregnancy; standard medical guidance applies.

Nattokinase supports fibrinolysis but is not a substitute for prescribed anticoagulant therapy, particularly in high-risk cardiovascular situations. If you are under medical care for a cardiovascular condition, disclose all supplements to your physician before making additions to your routine.

6. BioAbsorb Nattokinase: Delayed-Release Delivery for the Cardiovascular Stack

If you're adding nattokinase to a cardiovascular supplement routine that already includes magnesium, delivery format matters. Nattokinase is an enzyme — it can be degraded in the stomach before it reaches the small intestine, where absorption occurs. BioAbsorb's Nattokinase Enzyme uses DRcaps delayed-release capsules — a pharmaceutical-grade delivery format that shields the enzyme from stomach acid and delivers it intact to the absorption site. Unlike standard enteric-coated capsules, DRcaps are free of phthalates and plasticizers, making them a cleaner option for health-conscious supplementers.

Each capsule provides 100 mg of nattokinase standardized to 2,000 FU of enzymatic activity — the dose used in the North American blood pressure trial and consistent with the clinically studied range across published RCTs. The formulation is intentionally free of Vitamin K2, which matters for people considering longer-term use: removing K2 eliminates the cardiovascular caveats associated with K2 accumulation for those already supplementing with it separately.

BioAbsorb manufactures in a Canadian GMP-certified facility, and the product is non-GMO, non-irradiated, and allergen-free — no gluten, nuts, eggs, dairy, fish, shellfish, or animal products, making it suitable for vegetarians. Every batch is third-party tested for nattokinase activity (confirmed ≥2,000 FU per capsule), heavy metals, and microbial contaminants, with certificates of analysis available on request. The 180-capsule supply — a 6-month supply at 1 capsule per day — is available at $49.87, approximately $0.28 per day.

Frequently Asked Questions

Can I take magnesium and nattokinase at the same time of day?

You can, but it's generally more practical not to. Nattokinase is best taken on an empty stomach — typically in the morning before breakfast — while many forms of magnesium are better tolerated with food, making evening dosing more comfortable. There is no pharmacokinetic reason the two cannot be consumed simultaneously, but the timing split tends to optimize tolerability for both.

Does combining magnesium and nattokinase increase my bleeding risk?

Not meaningfully for most healthy adults at standard doses. Nattokinase has fibrinolytic activity and mild antiplatelet properties, while magnesium at supplemental doses does not produce clinically significant anticoagulation on its own. The risk changes substantially when either supplement is added alongside prescription blood thinners — in those cases, physician oversight is essential before proceeding.

What forms of magnesium pair well alongside nattokinase?

There is no form of magnesium that specifically enhances or impairs nattokinase's fibrinolytic activity — the two don't interact biochemically, so the choice of magnesium form comes down to your absorption needs and GI tolerance. Magnesium glycinate and malate tend to cause less digestive disruption than oxide at equivalent doses, and the NIH Office of Dietary Supplements identifies aspartate, citrate, lactate, and chloride as among the more bioavailable forms.

Can I take both if I'm already on blood pressure medication?

Discuss it with your doctor first. Both supplements have demonstrated blood pressure-lowering effects — magnesium through vascular relaxation, nattokinase through fibrinolytic and renin-related mechanisms — and adding either to an antihypertensive regimen could produce additive reductions that require medication adjustment. This is not a reason to avoid both, but it is a reason to monitor your readings with your care team before and after beginning.

Does nattokinase need magnesium as a cofactor to work?

No. Nattokinase is a serine protease — its active site relies on a serine amino acid residue rather than a metal ion cofactor. It does not require magnesium, zinc, or any other mineral to function. The enzyme's fibrinolytic activity is entirely independent of your magnesium status, which means adding magnesium to your routine will neither enhance nor diminish how nattokinase performs.

Conclusion

Magnesium and nattokinase address different points in the cardiovascular system — magnesium working upstream through vascular tone and enzyme cofactor activity, nattokinase working downstream through fibrin clearance and blood pressure modulation. For most healthy adults not on blood-thinning medications, combining them at standard doses is both safe and potentially beneficial for cardiovascular health. If you're building or refining a cardiovascular supplement stack, BioAbsorb's Nattokinase Enzyme — 2,000 FU per DRcaps capsule, third-party tested, Canadian-made — is a clean, well-formulated place to start.

Research References

1. Consumption of nattokinase is associated with reduced blood pressure and von Willebrand factor: results from a randomized, double-blind, placebo-controlled, multicenter North American clinical trial. Integrated Blood Pressure Control, Vol. 9 (2016). Jensen GS et al. Randomized controlled trial demonstrating statistically significant diastolic blood pressure reduction in 74 North American participants consuming 100 mg/2,000 FU nattokinase daily for 8 weeks.
2. Effects of nattokinase on blood pressure: a randomized, controlled trial. Hypertension Research, Vol. 31 (2008). Kim JY et al. Controlled trial in 86 participants with untreated systolic BP 130–159 mmHg receiving 2,000 FU nattokinase or placebo for 8 weeks.
3. Nattokinase Supplementation and Cardiovascular Risk Factors: A Systematic Review and Meta-Analysis of Randomized Controlled Trials. [journal details not confirmed] (2024). Meta-analysis of 6 RCTs (546 participants); supports nattokinase as effective adjunctive therapy for hypertension; no notable adverse events across all included studies.
4. Nattokinase: A Promising Alternative in Prevention and Treatment of Cardiovascular Diseases. [journal details not confirmed] (2018). Comprehensive mechanism review covering nattokinase's direct fibrinolytic action, PAI-1 inhibition, tPA enhancement, and antiplatelet properties.
5. Magnesium Supplementation and Blood Pressure: A Systematic Review and Meta-Analysis of Randomized Controlled Trials. Hypertension (American Heart Association), 2025. 38 RCTs, 2,709 participants; systolic BP reduced by −2.81 mmHg and diastolic by −2.05 mmHg; effects most pronounced in hypertensive individuals with low baseline magnesium.
6. Challenges in the Diagnosis of Magnesium Status. [journal details not confirmed] (2018). Epidemiological review establishing that approximately 45% of Americans are magnesium deficient and 60% of adults fail to reach the average dietary intake.
7. Effect of extracellular magnesium on platelet activation and intracellular calcium mobilization. [journal details not confirmed]. Demonstrated dose-dependent inhibition of platelet aggregation by magnesium in human platelets across multiple aggregation agents at supraphysiological concentrations.
8. Magnesium — Health Professional Fact Sheet. National Institutes of Health — Office of Dietary Supplements (2022). Authoritative reference on magnesium's role as cofactor in 300+ enzyme systems; RDA guidance; sudden cardiac death data from the 14,232-person Atherosclerosis Risk in Communities Study.

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.