Vitamin K2 (MK-7) vs MK-4: What’s the Difference?

Illustration of vitamin K2 and bone health nutrients

Vitamin K2 includes several menaquinone forms, but MK-4 and MK-7 are the two most commonly discussed. They differ mainly in food sources and how long they remain in the body. This guide compares MK-4 and MK-7, reviews dietary sources, and explains important supplement and medication considerations.

What Is Vitamin K2?

Vitamin K2 is a fat-soluble vitamin involved in blood clotting and calcium metabolism. It belongs to the vitamin K family, which also includes vitamin K1. K2 is found in several forms, including MK-4 and MK-7.

MK-4 vs. MK-7: Key Differences

FeatureMK-4MK-7
Common sourcesMeat, egg yolks, and dairy productsNatto, some cheeses, fermented vegetables, and supplements
Time in the bodyShorter half-lifeLonger half-life
General profileRapidly absorbed and shorter-actingLonger-lasting in the bloodstream

The longer half-life of MK-7 is one reason it is frequently used in supplements. That does not automatically make it better for everyone; the appropriate choice depends on diet, health needs, and medical guidance.

Food Sources of MK-4

  • Meat, including organ meats such as liver
  • Egg yolks
  • Dairy foods such as cheese and butter

Food Sources of MK-7

  • Natto, made from fermented soybeans
  • Some cheeses, including Gouda and Edam
  • Other fermented foods
Vitamin K2 MK-4 and MK-7 supplement bottle with fermented foods

Potential Roles of Vitamin K2

Vitamin K2 helps activate proteins involved in calcium handling and bone metabolism. Both MK-4 and MK-7 are studied for their possible roles in bone and cardiovascular health, but the available evidence does not justify treating either form as a guaranteed prevention or treatment for disease.

Bone Health

Vitamin K2 contributes to the activation of proteins associated with bone tissue. Dietary patterns, vitamin D status, minerals, and overall health also matter. Read more about vitamin K2 and calcium absorption.

Cardiovascular Health

K2 is involved in proteins related to calcium in blood vessels. Research continues to examine whether supplementation can meaningfully affect cardiovascular outcomes. It should not replace prescribed cardiovascular care.

Other Claims

Vitamin K2 is also discussed in relation to dental health and inflammation, but these areas require careful interpretation of the evidence. See vitamin K2 and dental health for more context.

Dosage and Supplementation

The original article lists general supplement ranges of 45–90 mcg daily for MK-4 and 90–360 mcg daily for MK-7. These are not individualized recommendations. Follow the product label and ask a healthcare professional which form and amount are appropriate for you.

Vitamin K products may interact with anticoagulant medicines, including warfarin. Anyone taking these medicines should consult their prescriber before changing vitamin K intake. For additional safety considerations, see vitamin K2 supplement side effects and the NIH Office of Dietary Supplements.

Frequently Asked Questions

Is MK-7 better than MK-4?

Not necessarily. MK-7 remains in the body longer, while MK-4 has a shorter half-life. The best option depends on dietary intake, goals, and medical advice.

Can I get K2 from food?

Some K2 comes from fermented foods and animal-derived foods. Intake varies widely with dietary pattern.

How long does it take to notice benefits?

There is no reliable timeframe that applies to everyone. Vitamin K2 should not be expected to produce immediate, noticeable effects.

Bottom Line

MK-4 and MK-7 are different forms of vitamin K2 with different food sources and time profiles. MK-7 is longer-lasting, while MK-4 is commonly associated with animal-derived foods. Consider your diet and medications, and seek professional advice before starting a supplement.

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