Is Vitamin K2 the Same as Nattokinase? Understanding the Difference

Reading time:11 min

Published:April 1, 2026

Author:

Cymbiotika

No—Vitamin K2 and nattokinase are not the same. While both originate from the traditional Japanese fermented soybean dish natto, they are distinct substances with unique chemical structures and biological roles. Vitamin K2 is a fat-soluble vitamin essential for calcium regulation, while nattokinase is a proteolytic enzyme that supports healthy blood flow and circulation. Understanding these differences is the first step toward an effective wellness routine. For a formula specifically built around this synergistic pairing, explore our Liposomal Vitamin D3 + K2 + CoQ10.

Introduction

Quick Answer: Vitamin K2 and nattokinase are different compounds. K2 is a fat-soluble vitamin that helps regulate where calcium is stored in the body, while nattokinase is an enzyme that supports circulation by assisting in the breakdown of fibrin.

What is Vitamin K2?

Vitamin K2 is a fat-soluble vitamin that belongs to the family of K vitamins. While Vitamin K1 is found in leafy greens and is primarily used for blood coagulation, Vitamin K2 acts as a "biological traffic controller." It ensures that calcium ends up in your bones and teeth rather than accumulating in your soft tissues and arteries. If you are exploring broader support for this life stage, the Healthy Aging Supplements collection is a helpful resource.

There are several forms of Vitamin K2, known as menaquinones. The most common forms found in supplements are MK-4 and MK-7. MK-4 has a relatively short half-life, while MK-7 (the form found in natto) stays in the bloodstream longer, allowing the body more time to utilize the vitamin for structural support.

The mechanism of Vitamin K2 centers on the activation of specific proteins. Osteocalcin helps bind calcium to the bone matrix, while Matrix Gla Protein (MGP) helps prevent calcium from building up in blood vessel walls. Without enough Vitamin K2, these proteins remain inactive, and dietary calcium may not reach its intended destination.

Key Takeaway: Vitamin K2 is an essential micronutrient that manages calcium distribution, helping to support bone density and cardiovascular health through protein activation.

What is Nattokinase?

Nattokinase is a proteolytic enzyme, meaning it is a specialized protein that breaks down other proteins. Unlike Vitamin K2, which is an essential nutrient, nattokinase is an enzyme produced specifically during the fermentation of soybeans by the bacterium Bacillus subtilis. It does not have a regulatory relationship with minerals like calcium.

The primary function of nattokinase is its fibrinolytic activity. Fibrin is a protein involved in blood clotting that forms a mesh-like structure to stop bleeding. However, the body must also break down fibrin efficiently to keep blood flowing smoothly. Nattokinase supports this process by directly breaking down fibrin and assisting the body's production of plasmin, an enzyme that dissolves clots. For a deeper look at formulation choices, see Why Remove Vitamin K2 From Nattokinase?.

Bioavailability is a significant factor when discussing enzymes. Because enzymes are complex proteins, they can be easily destroyed by stomach acid. Standard capsules may not always protect the enzyme enough for it to reach the small intestine intact. When choosing a supplement, consider how the formulation protects these sensitive compounds.

Comparing the Two: Key Differences

While both are concentrated in natto, they are chemical opposites. One is a fat-soluble vitamin used for mineral regulation; the other is a bioactive enzyme that works on blood fluidity.

Feature
Vitamin K2
Nattokinase

Type of Compound
Fat-Soluble Vitamin
Proteolytic Enzyme

Primary Source
Fermented foods, animal fats
Fermented soybeans (natto)

Main Function
Calcium regulation and bone support
Fibrin breakdown and blood flow support

Body Role
Activates proteins (Osteocalcin, MGP)
Dissolves fibrin mesh

Nutrient Class
Essential micronutrient
Supplemental enzyme

The most important distinction is their relationship with blood. Vitamin K1 drives clotting, while Vitamin K2 manages calcification for cardiovascular health. Nattokinase focuses on the "clean-up" side, ensuring blood stays at an ideal viscosity. For related education, Why Vitamin K2 is Essential for Your Health Routine is a useful next read.

Myth: All "natto" supplements contain both nattokinase and Vitamin K2.
Fact: Many nattokinase supplements have Vitamin K2 removed to avoid interactions with specific medications, while K2 supplements rarely contain the enzyme unless explicitly labeled.

Quick Summary:

Both nutrients are derived from the fermented food natto but function differently.
Vitamin K2 acts as a nutrient that directs calcium to bones and away from arteries.
Nattokinase is an enzyme that supports circulation by breaking down fibrin.
Effective delivery systems are required to ensure these compounds are properly absorbed.

How Vitamin K2 Supports Your Body

Vitamin K2 is a fundamental pillar of healthy aging. As we age, our bodies handle minerals differently. Many people focus on calcium intake for bone health, but without the "directions" provided by Vitamin K2, that calcium may not be utilized effectively—a situation often called the "Calcium Paradox."

Bioavailability plays a massive role here. Because Vitamin K2 is fat-soluble, it requires a fat source for absorption. Our Liposomal Vitamin D3 + K2 + CoQ10 wraps these nutrients in a phospholipid bilayer, allowing them to bypass digestive breakdown and enter the bloodstream efficiently. To compare the ingredients, visit our Knowledge Center for D3 + CoQ10.

Beyond bone and heart support, Vitamin K2 may also:

Support healthy energy metabolism.
Assist in maintaining healthy teeth and jaw structure.
Help the vascular system respond to oxidative stress.

How Nattokinase Supports Your Body

Nattokinase acts like a natural sculptor for your circulatory system. Lifestyle factors like a sedentary routine, travel, or aging can make it harder for the body to maintain optimal circulation. Nattokinase provides enzymatic support to help keep the pathways clear.

By targeting fibrin, nattokinase supports the body's natural ability to dissolve proteins that can make blood "sticky." It is often used by those who spend long hours sitting or those looking to support cardiovascular endurance.

It is important to note the stability of nattokinase. Enzymes are measured in Fibrinolytic Units (FU) rather than milligrams. This measurement indicates the active "work" the enzyme can do. Look for high FU counts and delivery systems that ensure the enzyme remains active until it reaches your gut.

The Synergy of the "Natto Duo"

While different, Vitamin K2 and nattokinase offer a two-pronged approach to cardiovascular wellness. If your cardiovascular system is a series of pipes, Vitamin K2 keeps the walls smooth and free of mineral buildup, while nattokinase ensures the fluid moving through those pipes doesn't become too thick or sluggish.

Many people find that a routine including both provides a comprehensive level of support. If you are deciding how to begin, our Supplement Quiz can help you personalize your approach.

Action Steps for Building Your Routine:

Step 1: Identify your primary health goal.
Determine if you are prioritizing bone density (Vitamin K2) or circulatory fluidity (nattokinase).

Step 2: Review your supplement labels.
Check if your current "natto" extracts have had the Vitamin K2 removed, as many are processed to be "K-free."

Step 3: Prioritize high-quality absorption.
Look for Vitamin K2 that is paired with a fat source or utilize a liposomal delivery system for better bioavailability.

Step 4: Consult with a healthcare professional.
If you are taking medications that affect your heart or blood, speak with a doctor before adjusting your routine.

Why Delivery Matters: The Bioavailability Factor

At Cymbiotika, we believe you are what you absorb. Standard supplements often face two major hurdles:

Degradation: Stomach acid can break down delicate enzymes like nattokinase before they can work.
Absorption Barriers: Fat-soluble vitamins like K2 struggle to pass through the water-based environment of the gut without a specialized carrier.

Liposomal delivery is designed to solve both problems. By encapsulating nutrients in phospholipids, we create a delivery vehicle the body recognizes, allowing a higher percentage of the active ingredient to reach the cellular level. To explore more formulas, browse the Liposomal collection.

Key Takeaway: The effectiveness of K2 and nattokinase depends on their delivery system; without protection from stomach acid and proper absorption pathways, these nutrients can lose their functional value.

Bottom line: Whether you are taking a vitamin or an enzyme, the quality of the formulation and the efficiency of the delivery system determine the real-world value of the supplement.

The Role of Fermented Foods vs. Supplements

Natto is the undisputed king of Vitamin K2 and nattokinase content. One tablespoon contains significant amounts of both. Other fermented foods like sauerkraut, kimchi, and aged cheeses (Gouda or Brie) contain Vitamin K2 but typically lack nattokinase, which is specific to the Bacillus subtilis fermentation process.

Because many find the taste and texture of natto difficult to tolerate, supplements offer a standardized, concentrated dose without the acquired taste. Transparency is key when choosing a supplement—ensure ingredients are tested for purity and clearly sourced.

Understanding Potential Interactions

Because both Vitamin K2 and nattokinase involve the cardiovascular system, consistency is more important than intensity. Sudden, massive changes in intake can affect your body's equilibrium.

If you are currently under medical care for heart or blood-related concerns, or if you are taking blood-modifying medications, you must speak with your healthcare provider before adding these to your routine. While these are natural compounds, their concentrated forms are potent.

Important: If you are taking blood-modifying medications, are under care for cardiovascular concerns, or have an upcoming surgery, consult your healthcare provider before adding these supplements to your routine.

Making an Informed Choice

Choosing between Vitamin K2 and nattokinase—or taking both—depends on your unique needs. If your focus is on long-term structural integrity and bone health, Vitamin K2 is the priority. If your concern is immediate circulation and maintaining healthy blood pressure already in the normal range, nattokinase may be the better fit.

Combining the "traffic control" of Vitamin K2 with the "clearing" action of nattokinase provides a balanced approach, supporting your cardiovascular system from two complementary angles.

Conclusion

Vitamin K2 and nattokinase are distinct tools in the wellness toolkit. Vitamin K2 ensures your bones stay strong and your arteries stay flexible by managing calcium. Nattokinase acts as an enzymatic assistant to maintain the smoothness and flow of your circulation.

Wellness is about building a consistent, science-backed routine that aligns with your body’s natural processes. If you are ready to find the right balance for your unique needs, we invite you to take our Health Quiz to build a personalized supplement stack.

"True wellness starts with transparency. When you understand the 'why' behind your supplements, you can build a routine based on trust and results rather than hype."

FAQ

Can I get enough Vitamin K2 and nattokinase from my diet alone?

While it is possible, it is challenging for those following a standard Western diet. Natto is the only significant source of nattokinase, and while K2 is found in some cheeses and meats, the concentrations are often low compared to traditional fermented sources. Supplementation provides a standardized dose that is easier for many people to maintain consistently.

Is Vitamin K2 the same as Vitamin K1?

No, they are different forms of the same vitamin family. Vitamin K1 is mostly found in green plants and is primarily used by the liver for blood clotting. Vitamin K2 is found in fermented foods and animal products and is used throughout the body for calcium regulation in the bones and blood vessels.

Should I take Vitamin K2 with food?

Yes, because Vitamin K2 is fat-soluble, it is best absorbed when taken with a meal that contains healthy fats. However, if you are using a liposomal delivery system, the nutrients are already encapsulated in a fat-based shell, which allows for excellent absorption even on an empty stomach.

Does nattokinase have any side effects?

Nattokinase is generally well-tolerated by most healthy adults when taken in appropriate doses. However, because it supports the breakdown of fibrin, people who have upcoming surgeries or those on blood-modifying medications should consult their doctor. Always start with the recommended dose on the label to see how your body responds.

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Table of Contents

Introduction

What is Vitamin K2?

What is Nattokinase?

Comparing the Two: Key Differences

How Vitamin K2 Supports Your Body

How Nattokinase Supports Your Body

The Synergy of the "Natto Duo"

Why Delivery Matters: The Bioavailability Factor

The Role of Fermented Foods vs. Supplements

Understanding Potential Interactions

Making an Informed Choice

Conclusion

FAQ

Dive deeper

Frequently searched

Recommended

Liposomal Advanced Creatine

Liquid Colostrum

Liposomal Elderberry

Frequently searched

Recommended

Liposomal Advanced Creatine

Liquid Colostrum

Liposomal Elderberry

What is Vitamin K2?

What is Nattokinase?

Comparing the Two: Key Differences

How Vitamin K2 Supports Your Body

How Nattokinase Supports Your Body

The Synergy of the "Natto Duo"

Why Delivery Matters: The Bioavailability Factor

The Role of Fermented Foods vs. Supplements

Understanding Potential Interactions

Making an Informed Choice

Conclusion

FAQ

Frequently searched

Recommended

Liposomal Advanced Creatine

Liquid Colostrum

Liposomal Elderberry