What Is Another Name for Vitamin K2?

Reading time:15 min

Published:April 1, 2026

Author:

Cymbiotika

If you have ever looked at a supplement label or a nutrition chart, you may have noticed that some vitamins carry multiple names. Vitamin K is one of the most common sources of this confusion. While most people are familiar with Vitamin K as a general category, it is actually a group of fat-soluble compounds with distinct roles in the body. You may be wondering what the specific, scientific name for the second form of this nutrient is and why those letters and numbers—like MK-7—appear so frequently in wellness discussions.

Introduction

At Cymbiotika, we believe that understanding the science behind your nutrients is the first step toward building a more effective wellness routine. Vitamin K2 is not just a single nutrient; it is a family of molecules that support bone health, cardiovascular function, and proper calcium utilization. In this article, we will explore the different names for Vitamin K2, how it differs from Vitamin K1, and why the specific form you choose matters for your body’s ability to absorb and use it.

By the end of this guide, you will understand the nuances of menaquinones and how to identify the most bioavailable forms. We will also discuss how this essential nutrient works in harmony with others to support your long-term vitality. For additional guidance on foundational wellness, explore Cymbiotika’s Healthy Aging & Recovery collection.

The Primary Scientific Name: Menaquinone

The most accurate scientific name for Vitamin K2 is menaquinone. While Vitamin K1 is known as phylloquinone, Vitamin K2 refers to a group of related compounds called menaquinones. These are distinguished by a specific chemical structure: a methylated naphthoquinone ring system with an aliphatic side chain.

In simpler terms, all forms of Vitamin K share a similar "head," but their "tails" vary in length. For Vitamin K2, this side chain is made of repeating units called isoprenoid residues. Because these tails can vary significantly in length, scientists use a shorthand to identify them. This is where the "MK-n" terminology comes from.

Quick Answer: Another name for Vitamin K2 is menaquinone. It is often abbreviated as MK-n, where "n" represents the number of isoprenoid units in its side chain, such as MK-4 or MK-7.

For a deeper look at this terminology, read How Vitamin K2 Works: The Science of Nutrient Synergy.

Understanding the MK Shorthand

When you see "MK" on a label, it stands for menaquinone. The number that follows—such as 4, 7, or 9—tells you how many isoprene units are in that specific molecule's tail. This might seem like a minor technical detail, but the length of that tail determines how the vitamin travels through your body, how long it stays in your system, and which tissues it reaches.

Menaquinone-4 (MK-4) is a short-chain form. It is often referred to as menatetrenone. This form is unique because it is the only menaquinone not primarily produced by bacteria. Instead, animal tissues can actually convert Vitamin K1 into MK-4.

Menaquinone-7 (MK-7) is a long-chain form. It is the most common form found in fermented foods like natto. Because its tail is longer, it remains in the bloodstream much longer than shorter forms, allowing it to reach peripheral tissues like your bones and the walls of your blood vessels more effectively.

You can learn more about this distinction in The Vital Role of Vitamin K2 MK7 for Daily Wellness.

Vitamin K1 vs. Vitamin K2: Distinct Identities

It is a common mistake to assume that all Vitamin K is the same. While they share a name, phylloquinone (K1) and menaquinone (K2) have very different sources and functions.

Vitamin K1 is primarily found in green leafy vegetables. Its main job is to support the liver in producing proteins necessary for blood clotting (coagulation). Because the liver handles K1 very efficiently, it is used up quickly and rarely reaches other parts of the body in high amounts.

Vitamin K2, or menaquinone, is found in fermented foods and animal products. Unlike K1, which stays mostly in the liver, K2 is redistributed through the blood to other tissues. This is why K2 is often linked to bone and arterial health rather than just blood clotting.

Key Takeaway: While Vitamin K1 (phylloquinone) supports blood clotting in the liver, Vitamin K2 (menaquinone) is better at reaching and supporting the bones and cardiovascular system.

For another explanation of this relationship, explore the benefits of Vitamin K2 for daily wellness.

The Different Forms of Menaquinone (MK-4 to MK-13)

The menaquinone family is quite large. While we focus heavily on MK-4 and MK-7 in the supplement world, there are actually subtypes ranging from MK-4 all the way to MK-13.

Short-Chain Menaquinones (MK-4)

MK-4, or menatetrenone, is found in meat, eggs, and dairy. It is absorbed quickly but also leaves the body quickly. Its half-life in the blood is measured in hours. This means if you are using MK-4, it generally requires multiple doses throughout the day to maintain consistent levels.

Long-Chain Menaquinones (MK-7, MK-8, MK-9)

These are primarily the products of bacterial fermentation. You can find them in aged cheeses, sauerkraut, and especially natto (fermented soybeans). Menaquinone-7 (MK-7) is the standout in this group. It has a much longer half-life—sometimes staying in the body for several days. This allows it to build up in the blood and provide a constant supply of Vitamin K to the tissues that need it most.

For more on MK-4 and MK-7, read MK-7 Vitamin K2: The Science of Superior Bioavailability.

Very Long-Chain Menaquinones (MK-10 and beyond)

These are mostly produced by bacteria in the human colon. While our gut bacteria produce these forms, our bodies are not very good at absorbing them from the lower intestine. Therefore, we still rely heavily on dietary intake or supplementation to meet our needs for these longer-chain menaquinones.

Why Bioavailability Matters for Vitamin K2

One of the most important questions we ask when designing any formulation is: "Does your body actually absorb this?" Bioavailability refers to how well a nutrient can be absorbed and used by the body.

Many standard Vitamin K supplements use dry tablets or cheap synthetic forms that the body struggles to process. Since Vitamin K2 is a fat-soluble vitamin, it requires a fat source to be absorbed properly. If you take a Vitamin K2 tablet on an empty stomach without any healthy fats, a large portion of that nutrient may simply pass through your system.

We prioritize liposomal delivery for fat-soluble nutrients. Liposomal delivery involves wrapping the nutrient in a phospholipid bilayer—a tiny bubble of fat that mimics our own cell membranes. This design is intended to protect the Vitamin K2 as it passes through the digestive tract and support its absorption directly into the bloodstream at the cellular level.

For a closer look at this formulation approach, read Why Pair Vitamin D with K2 for Optimal Support.

Formulation quality changes what your body actually gets. Choosing a long-chain form like MK-7 in a liposomal format can significantly increase the chances that the vitamin will actually reach your bones and arteries rather than being filtered out by the liver.

How Vitamin K2 Works: The Activation Process

To understand why menaquinone is so vital, you have to look at what it does once it enters your cells. Vitamin K2 acts as a "switch" for specific proteins. It functions as a co-factor for an enzyme that modifies these proteins so they can bind to calcium.

Osteocalcin and Bone Support

One of these proteins is osteocalcin. When Vitamin K2 activates osteocalcin, it allows the protein to grab calcium from the blood and lock it into the bone matrix. This process is essential for maintaining bone mineral density and strength. Without enough Vitamin K2, even if you take plenty of calcium, that calcium might not end up in your bones where it belongs.

Matrix Gla Protein (MGP) and Heart Health

Another critical protein is Matrix Gla Protein (MGP). MGP is found in the walls of your arteries. When it is activated by Vitamin K2, it helps prevent calcium from depositing in the soft tissues of your blood vessels. This "calcium paradox" is a key concept in wellness: you want calcium in your bones, but you do not want it in your arteries. Vitamin K2 is the primary nutrient responsible for directing this traffic.

Bottom line: Vitamin K2 (menaquinone) activates proteins that move calcium into the bones and keep it out of the arteries, making it essential for both skeletal and cardiovascular wellness.

Natural Sources of Menaquinone

If you are looking to increase your intake of Vitamin K2 through food, you need to look toward fermentation and high-quality animal products. Standard Western diets are often quite low in these specific foods, which is why many people find supplementation helpful.

Natto: This traditional Japanese dish of fermented soybeans is the richest known source of MK-7.
Aged Cheeses: Cheeses like Gouda, Edam, and Jarlsberg contain moderate amounts of MK-7, MK-8, and MK-9 due to the specific bacteria used in the fermentation process.
Egg Yolks: These provide a source of MK-4, especially if the chickens were pasture-raised.
Grass-Fed Butter and Meat: Animal products contain MK-4, but the concentration is much higher when the animals have access to Vitamin K1-rich grass, which they then convert into K2.
Fermented Vegetables: Sauerkraut and kimchi can provide small amounts of K2, though they are usually much higher in K1.

Note: If you are taking blood-thinning medications, you should always consult your healthcare provider before significantly increasing your intake of Vitamin K-rich foods or starting a new supplement. Vitamin K plays a role in the body’s natural clotting process, which can interfere with certain medications.

The Synergy: Vitamin D3 and K2

You will often see Vitamin K2 (menaquinone) paired with Vitamin D3. This is not a coincidence; these two nutrients work in a highly coordinated partnership.

Vitamin D3 helps your body absorb calcium from your diet. Once that calcium is in your bloodstream, Vitamin K2 takes over to ensure it is deposited in the right places. Taking high doses of Vitamin D3 without enough Vitamin K2 can lead to a buildup of calcium in the blood without a clear path to the bones.

Our Liposomal Vitamin D3 + K2 + CoQ10 is designed with this synergy in mind. By combining these nutrients in a liposomal format, we support the body's ability to maintain healthy calcium levels while protecting the cardiovascular system.

How to Build a Vitamin K2 Routine

Building a sustainable routine is about consistency over intensity. You do not need to overcomplicate your stack, but you should be intentional about how and when you take your nutrients.

Step 1: Check your current intake. / Look at your diet. Do you eat fermented foods regularly? If not, you may want to consider a supplement that provides MK-7 for its long-lasting effects.

Step 2: Choose the right format. / Opt for a liquid or liposomal form rather than a dry capsule. This helps with the absorption of fat-soluble menaquinones.

Step 3: Pair with a meal. / Even with liposomal delivery, taking your Vitamin K2 with a meal that contains some healthy fats (like avocado or olive oil) can further support the absorption process.

Step 4: Be consistent. / Because MK-7 stays in your system for several days, taking it daily allows levels to stabilize in your blood, providing continuous support for your bones and heart.

Myth vs. Fact: Common Misconceptions

Myth: "Vitamin K1 and K2 are interchangeable."
Fact: While they are related, they serve different functions. K1 is for the liver and blood clotting, while K2 is for the bones and blood vessels.

Myth: "I get enough Vitamin K from my salads."
Fact: Leafy greens are high in K1 (phylloquinone), but they contain almost no K2 (menaquinone). You need fermented foods or animal products to get K2.

Myth: "Higher milligrams always mean better results."
Fact: Absorption matters more than dose. A smaller, highly bioavailable dose of MK-7 is often more effective than a large dose of poorly absorbed K1 or MK-4.

Selecting a Quality Supplement

When searching for a Vitamin K2 supplement, the label might be confusing. Look specifically for "Menaquinone-7" or "MK-7." This indicates the long-chain form that is most effectively used by the body.

Furthermore, transparency is key. We believe wellness starts with trust. That means no hidden ingredients, no synthetic fillers, and third-party testing for purity. Check to see if the brand uses non-GMO ingredients and follows Good Manufacturing Practices (GMP).

We use organic and wild-crafted sourcing whenever possible. Our focus is on providing clean, transparent formulations that skip the unnecessary additives found in many drugstore vitamins. When you choose a product, you should feel confident that what is on the label is exactly what is in the bottle.

Healthy Ageing and Menaquinone

As we age, the way our bodies handle calcium becomes even more important. Maintaining bone density and keeping blood vessels flexible are two of the biggest priorities for long-term health. Because many people reduce their intake of heavy dairy or specific fermented foods as they get older, the risk of a Vitamin K2 deficiency can increase.

Supporting your body with the right form of menaquinone may help maintain bone mineral density and support the structural integrity of the heart. It is a simple addition to a routine that can have meaningful long-term value for healthy ageing.

Conclusion

Understanding that another name for Vitamin K2 is menaquinone is just the beginning. Whether you are looking at MK-4 or MK-7, the goal is the same: to ensure your body has the tools it needs to manage calcium effectively and support your skeletal and cardiovascular systems.

At Cymbiotika, our mission is to empower you with the knowledge and high-quality supplements necessary to take control of your health. By focusing on bioavailability and clean sourcing, we help you build a routine that actually works. If you are unsure where to start with your supplement journey, we recommend taking our Health Quiz. It is designed to provide personalized recommendations based on your unique goals and lifestyle, helping you find the perfect balance of nutrients like Vitamin K2, D3, and more.

Vitamin K2 is scientifically known as menaquinone (MK-n).
MK-7 is the most bioavailable and longest-lasting form for skeletal support.
Bioavailability is the key to ensuring these nutrients reach your cells.
Transparency and quality sourcing are essential for a trustworthy supplement routine.

FAQ

What is the difference between menaquinone and phylloquinone?

Phylloquinone is the scientific name for Vitamin K1, which is found in green vegetables and primarily supports blood clotting in the liver. Menaquinone is the scientific name for Vitamin K2, found in fermented foods and animal products, which supports bone health and protects the cardiovascular system by regulating calcium.

Is MK-7 the same as Vitamin K2?

Yes, MK-7 (Menaquinone-7) is a specific subtype of Vitamin K2. It is considered one of the most effective forms for supplementation because it has a long half-life, meaning it stays in the bloodstream longer than other forms like MK-4 and can reach more tissues throughout the body. Learn more about MK-7 Vitamin K2 and bioavailability.

Why is Vitamin K2 often called the "forgotten vitamin"?

It earned this nickname because, for many years, scientists believed Vitamin K1 was the only form necessary for human health. It wasn't until more recently that the unique roles of Vitamin K2 in bone mineralization and arterial health were fully understood, leading to a surge in its popularity in wellness routines.

Can I get enough Vitamin K2 from a vegan diet?

It is more challenging to get Vitamin K2 from a vegan diet because it is primarily found in animal products and specific fermented foods. While natto is a vegan-friendly powerhouse of MK-7, many people on a plant-based diet choose to supplement with a high-quality, vegan Vitamin K2 to ensure they are meeting their nutritional needs. Explore Vitamin D3 and K2 together for more context.

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Table of Contents

Introduction

The Primary Scientific Name: Menaquinone

Vitamin K1 vs. Vitamin K2: Distinct Identities

The Different Forms of Menaquinone (MK-4 to MK-13)

Why Bioavailability Matters for Vitamin K2

How Vitamin K2 Works: The Activation Process

Natural Sources of Menaquinone

The Synergy: Vitamin D3 and K2

How to Build a Vitamin K2 Routine

Myth vs. Fact: Common Misconceptions

Selecting a Quality Supplement

Healthy Ageing and Menaquinone

Conclusion

FAQ

Dive deeper

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Frequently searched

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The Primary Scientific Name: Menaquinone

Vitamin K1 vs. Vitamin K2: Distinct Identities

The Different Forms of Menaquinone (MK-4 to MK-13)

Why Bioavailability Matters for Vitamin K2

How Vitamin K2 Works: The Activation Process

Natural Sources of Menaquinone

The Synergy: Vitamin D3 and K2

How to Build a Vitamin K2 Routine

Myth vs. Fact: Common Misconceptions

Selecting a Quality Supplement

Healthy Ageing and Menaquinone

Conclusion

FAQ

Frequently searched

Recommended

Liposomal Advanced Creatine

Liquid Colostrum

Liposomal Elderberry