Where Does Vitamin K2 Come From? Sources and Benefits

Reading time:14 min

Published:March 18, 2026

Author:

Cymbiotika

You may have spent years focused on getting your leafy greens to ensure you have enough vitamin K. While those salads are excellent for your health, they primarily provide vitamin K1. Recently, health conversations have shifted toward another form of this nutrient that is just as vital but much harder to find in a standard modern diet: vitamin K2. Understanding where vitamin K2 comes from is the first step in ensuring your body has what it needs to support bone density and cardiovascular health.

Introduction

At Cymbiotika, we believe that transparency in sourcing and formulation is the foundation of wellness. Vitamin K2 is a unique nutrient because it is not typically found in the plants we eat. Instead, it is a byproduct of bacterial activity, found in fermented foods and specific animal products. Because it is fat-soluble, how your body absorbs it is just as important as where it comes from.

In this guide, we will explore the origins of vitamin K2, the different subtypes you should know about, and how to ensure you are choosing the most bioavailable forms for your daily routine. We aim to help you bridge the gap between basic nutrition and advanced cellular support.

The Two Faces of Vitamin K: K1 vs. K2

To understand where vitamin K2 comes from, we first have to distinguish it from its more famous relative, vitamin K1. While they share a name and a similar chemical structure, they behave very differently once they enter your system.

Vitamin K1, or phylloquinone, is primarily found in green leafy vegetables. Its main role in the body is supporting healthy blood clotting. It is processed quickly by the liver and typically leaves the system within a few hours.

Vitamin K2, or menaquinone, is far more elusive. While K1 is made by plants through photosynthesis, K2 is synthesized by bacteria. It has a longer side chain of molecules, which allows it to stay in your bloodstream much longer than K1—sometimes for several days. This extended presence gives vitamin K2 more time to reach tissues outside of the liver, such as your bones and the walls of your blood vessels.

The MK Subtypes

Vitamin K2 is actually a group of compounds called menaquinones, abbreviated as "MK" followed by a number. The number refers to the length of the molecular side chain. The most common forms found in food and supplements are:

MK-4: Primarily found in animal products like meat and eggs.
MK-7: Produced during the fermentation process by specific bacteria.

Key Takeaway: Vitamin K1 comes from plants and focuses on the liver, while vitamin K2 is a bacterial product that supports your bones and heart over a longer period.

Where Does Vitamin K2 Come From?

The primary "factories" for vitamin K2 are bacteria. Unlike vitamin C, which a plant produces as it grows, vitamin K2 is created when bacteria consume and transform other substances. This happens in three main environments: fermented foods, animal tissues, and within your own digestive tract.

1. Fermented Foods

The most concentrated source of vitamin K2 in the world is a traditional Japanese dish called natto. Natto is made by fermenting soybeans with a specific strain of bacteria called Bacillus subtilis. This process creates the MK-7 subtype of vitamin K2 in incredibly high amounts.

Other fermented foods also contain K2, though in much smaller concentrations than natto. These include:

Sauerkraut: When cabbage is fermented by lactic acid bacteria, small amounts of K2 are produced.
Kefir and Yogurt: Certain cultures used to ferment dairy can produce menaquinones.
Hard and Soft Cheeses: Bacteria used in the aging process of cheeses like Gouda, Edam, and Jarlsberg create vitamin K2 as they break down the dairy.

For a broader look at how vitamin D3 and K2 work together, explore this guide to why vitamin K2 is paired with D3.

2. Animal Products

Animals can convert vitamin K1 from the grass they eat into vitamin K2 (specifically MK-4) within their tissues. This is why the quality of the animal's diet matters so much. A cow that is pasture-raised and eats grass will have significantly higher levels of K2 in its milk and fat than a cow raised on grain.

Common animal sources include:

Grass-fed Butter and Ghee: These are concentrated sources of the MK-4 subtype.
Egg Yolks: The yolk contains the fat-soluble K2 converted by the hen.
Organ Meats: The liver is a storage site for many fat-soluble vitamins, including K2.
Dark Meat Chicken: Poultry is a surprisingly good source of MK-4 compared to lean beef.

3. Your Gut Microbiome

Your body is home to trillions of bacteria, some of which are capable of producing vitamin K2 in your large intestine. This internal production provides a baseline level of the nutrient. However, research suggests that the K2 produced in the colon is not very well absorbed because it is located too far down the digestive tract, past the small intestine where most fat-soluble nutrient absorption occurs.

Myth: You can get all the vitamin K2 you need just from eating salads.
Fact: Leafy greens provide vitamin K1. To get vitamin K2, you must consume fermented foods, grass-fed animal products, or high-quality supplements.

The Importance of Bioavailability

Finding a source of vitamin K2 is only half the battle. The other half is ensuring that the K2 you consume actually reaches your cells. This is the concept of bioavailability—the degree and rate at which a nutrient is absorbed and becomes available for use by the body.

Because vitamin K2 is fat-soluble, it requires fat to be transported across the gut lining. If you take a standard K2 tablet on an empty stomach, much of it may simply pass through your system. This is where formulation design becomes critical.

We prioritize bioavailability in everything we create. Our Liposomal Vitamin D3 + K2 + CoQ10 is a prime example of this philosophy. By using liposomal delivery—essentially wrapping the nutrients in a tiny bubble of healthy fats called a phospholipid bilayer—we help the vitamin K2 bypass the harsh environment of the digestive tract. This phospholipid bilayer is the same material that makes up your cell membranes, allowing the nutrients to be absorbed more efficiently at the cellular level.

For more on this delivery approach, read our guide to how liposomal delivery supports vitamin D3 and K2.

Why MK-7 is the Preferred Supplement Form

When looking at supplement labels, you will often see MK-7. This form is typically derived from the fermentation of chickpeas or soy. It is preferred over MK-4 in supplement form because of its long half-life. While MK-4 is cleared from the blood in a few hours, MK-7 remains available to your tissues for up to 72 hours, providing a more consistent level of support for your bones and cardiovascular system.

How Vitamin K2 Works in Your Body

To appreciate why you need to seek out these specific sources, it helps to understand what K2 does once it is absorbed. Its primary job is to act as a traffic controller for calcium.

The Calcium "GPS"

Calcium is essential for strong bones, but it can be dangerous if it ends up in the wrong places. If calcium deposits in your arteries instead of your bones, it can lead to hardening of the blood vessels. Vitamin K2 activates a protein called osteocalcin, which helps bind calcium to the bone matrix. At the same time, it activates Matrix GLA Protein (MGP), which helps prevent calcium from accumulating in soft tissues like the heart and kidneys.

Without adequate vitamin K2, calcium may wander aimlessly. You want that calcium in your skeleton, not your circulatory system.

The Synergy with Vitamin D3

Vitamin K2 does not work in a vacuum. It has a close relationship with vitamin D3. While vitamin D3 helps your body absorb calcium from the food you eat, vitamin K2 ensures that the absorbed calcium goes where it belongs. Taking high doses of vitamin D3 without sufficient K2 can potentially lead to an imbalance in how calcium is distributed in the body.

For another perspective on this relationship, see our guide to the synergy between vitamin K2 and D3.

Bottom line: Vitamin K2 is the essential partner to Vitamin D and calcium, ensuring that minerals support your bone structure rather than your arterial walls.

Practical Ways to Increase Your Vitamin K2 Intake

If you are looking to improve your K2 levels, consistency is more important than intensity. You do not need to eat a massive bowl of natto once a month; rather, you should focus on building a routine that includes small, bioavailable amounts daily.

Step 1: Diversify Your Fermented Foods

If you are adventurous, try incorporating natto into your diet. For most Western palates, this can be a challenge. If natto isn't for you, look for high-quality, aged cheeses like Gouda or Brie. If you prefer plant-based options, unpasteurized sauerkraut or kimchi provide smaller but beneficial amounts.

Step 2: Choose Grass-Fed and Pasture-Raised

When buying butter, eggs, or meat, the "grass-fed" label is not just a marketing term—it is a marker of nutrient density. Animals that forage on open pastures consume more K1, which they then convert into the K2 (MK-4) found in the fat you eventually consume.

Step 3: Address the Absorption Gap

Most people struggle to get enough K2 from food alone, especially the long-lasting MK-7 form. This is where a science-forward supplement can help. When choosing a supplement, ask yourself:

Is it fat-soluble? Does the formula include a lipid delivery system?
What is the subtype? Does it use MK-7 for longer-lasting blood levels?
Is it tested? Is the product third-party tested for purity and potency?

Our Liposomal Vitamin D3 + K2 + CoQ10 is designed to address these questions. We use the MK-7 form and deliver it via a liposomal liquid to support maximum absorption. This ensures that the nutrients you are paying for actually make it into your system.

For additional guidance on choosing a routine, explore the Healthy Aging & Recovery collection.

Who Should Pay Extra Attention to Vitamin K2?

While everyone can benefit from a balanced intake of menaquinones, certain groups might find K2 particularly supportive for their wellness goals.

Those Focused on Bone Density: As we age, maintaining bone mineral density becomes a priority. Because K2 activates the proteins that build bone, it is a foundational part of a healthy aging routine.
Individuals Taking Vitamin D: If you already supplement with vitamin D, adding K2 is a logical step to ensure proper calcium metabolism.
People with Limited Diets: If you do not eat fermented foods or animal products, your natural intake of K2 is likely very low. Plant-based eaters should look for MK-7 supplements derived from fermented chickpeas or soy.

Note: If you are taking blood-thinning medications, it is vital to consult with your healthcare provider before changing your vitamin K intake, as it can interact with those medications.

The Quality Standard

At Cymbiotika, we believe wellness starts with trust. The supplement industry is often filled with standard tablets and capsules that the body struggles to break down and absorb. When we formulated our K2 products, we looked at the science of the gut-blood barrier. We chose liposomal delivery because it honors the way your body naturally processes fats and fat-soluble vitamins.

We also believe in transparency. We source our ingredients from the cleanest possible origins—using non-GMO, organic, and wild-crafted materials whenever possible. We don’t use synthetic fillers or hidden additives. When you look at our labels, you see exactly what you are putting into your body.

For more on evaluating supplement quality and formulation, explore how to balance vitamin D3 and K2 intake.

Building Your Wellness Routine

Adding vitamin K2 to your life shouldn't be a source of stress. It is about making small, informed choices that add up over time. Whether it's choosing grass-fed butter at the grocery store or adding a pump of our Liposomal Vitamin D3 + K2 + CoQ10 to your morning water, these habits build a foundation for long-term vitality.

Remember that wellness is a journey, not a destination. Your body responds best to consistent, high-quality inputs. By focusing on bioavailability and clean sourcing, you are giving your cells the tools they need to thrive.

Conclusion

Vitamin K2 is a powerful example of how complex and interconnected our nutrition truly is. It doesn't come from the usual suspects like oranges or spinach; it comes from the quiet work of bacteria in fermentation vats, the digestive tracts of pasture-raised animals, and high-quality, science-backed formulations.

By understanding that K2 is the "GPS" for calcium, you can see why it is so essential for maintaining strong bones and a healthy heart. At Cymbiotika, we are committed to helping you navigate these nuances with products that prioritize absorption and purity. We want to empower you to take control of your health with information you can trust and supplements that actually work.

If you are ready to see how vitamin K2 fits into a personalized wellness plan, we invite you to take our Health Quiz. It is designed to help you identify the gaps in your current routine and provide a tailored roadmap to help you reach your goals.

Key Takeaway: Vitamin K2 is essential for directing calcium to your bones and away from your heart. Because it is rare in the modern diet, focusing on bioavailable sources like fermented foods or liposomal supplements is a smart strategy for long-term health.

FAQ

Is vitamin K2 the same as vitamin K?

Vitamin K is a family of fat-soluble vitamins, but K1 and K2 have different roles. Vitamin K1 is primarily involved in blood clotting and is found in green vegetables, while K2 supports bone and heart health by regulating calcium and is found in fermented and animal foods.

Can I get vitamin K2 from being a vegan?

Yes, but your options are more limited. The best vegan source of vitamin K2 is natto (fermented soybeans) or other fermented foods like sauerkraut and kimchi. Many vegan supplements use MK-7 derived from fermented chickpeas or soy to provide a highly bioavailable source of K2.

Does cooking food destroy vitamin K2?

Vitamin K2 is relatively heat-stable, so it generally survives the cooking process better than some water-soluble vitamins like vitamin C. However, the bacteria that produce K2 (in foods like sauerkraut) are often killed by high heat, so consuming some fermented foods raw or lightly warmed is often recommended for gut health benefits.

Why should I take vitamin K2 with vitamin D3?

Vitamin D3 and K2 work together in a synergistic way to manage calcium. Vitamin D3 helps your body absorb calcium, while vitamin K2 ensures that the calcium is deposited in your bones rather than your arteries, making them a crucial pair for bone and cardiovascular support.

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Table of Contents

Introduction

The Two Faces of Vitamin K: K1 vs. K2

Where Does Vitamin K2 Come From?

The Importance of Bioavailability

How Vitamin K2 Works in Your Body

Practical Ways to Increase Your Vitamin K2 Intake

Who Should Pay Extra Attention to Vitamin K2?

The Quality Standard

Building Your Wellness Routine

Conclusion

FAQ

Dive deeper

Frequently searched

Recommended

Liposomal Advanced Creatine

Liquid Colostrum

Liposomal Elderberry

Frequently searched

Recommended

Liposomal Advanced Creatine

Liquid Colostrum

Liposomal Elderberry

The Two Faces of Vitamin K: K1 vs. K2

Where Does Vitamin K2 Come From?

The Importance of Bioavailability

How Vitamin K2 Works in Your Body

Practical Ways to Increase Your Vitamin K2 Intake

Who Should Pay Extra Attention to Vitamin K2?

The Quality Standard

Building Your Wellness Routine

Conclusion

FAQ

Frequently searched

Recommended

Liposomal Advanced Creatine

Liquid Colostrum

Liposomal Elderberry