What is Vitamin K2? Benefits, sources and side effects!
Vitamin K2 is a fat-soluble vitamin that contributes to normal blood clotting and helps maintain normal bones, according to approved health claims. Interest in vitamin K2 continues to grow, supported by scientific research exploring its role in human health. Vitamin K2 works alongside calcium and vitamin D as part of the complex system involved in bone metabolism and may help support vascular health when consumed as part of a balanced diet.
By ensuring an adequate intake of vitamin K2 from dietary sources, we support our body's physiological functions and contribute to maintaining overall health.
In this comprehensive blog post, we will take a deep dive into what vitamin K2 is, where it can be found, its recognised roles in the body, and important considerations regarding potential side effects. Let’s explore the world of vitamin K2!
Table of Contents
- What is Vitamin K2?
- Functions of Vitamin K2
- Dietary Sources and Intake
- Side Effects and Precautions
- Frequently Asked Questions
- Conclusion
What is Vitamin K2?
Vitamin K2 is part of the vitamin K family, a group of fat-soluble compounds that play a key role in maintaining normal health. It includes several subtypes, with MK-4 and MK-7 being the most well-researched. Vitamin K2 contributes to normal blood clotting and supports the maintenance of normal bones by activating proteins involved in calcium metabolism.
Vitamin K2 and vitamin K1 differ in both dietary sources and biological activity. While vitamin K1 is primarily found in leafy green vegetables and supports blood clotting, vitamin K2 is typically found in fermented foods and contributes to maintaining bone health through its role in calcium utilization.
Functions of Vitamin K2
Vitamin K2 contributes to the maintenance of normal bones and supports normal blood coagulation, as recognised by EU-approved health claims. Research continues to investigate its role in various physiological processes. Some observational studies have explored associations between higher vitamin K2 intake and bone mineral density in aging populations.
Vitamin K2 works together with vitamin D in supporting normal bone function, as both nutrients play complementary roles in calcium metabolism. However, current EU regulations do not permit disease risk reduction claims for vitamin K2, such as lowering the risk of osteoporosis or cardiovascular events.
Scientific interest has also turned to the potential interaction between vitamin K2 and metabolic health. While ongoing research is exploring possible mechanisms related to glucose metabolism, no authorised health claims currently support these effects under EU law. Further evidence is required before such claims can be communicated in consumer materials.
Including vitamin K2 as part of a balanced, varied diet helps support the body's natural physiological functions.
Dietary Sources and Intake
Vitamin K2 is found mainly in fermented foods. Natto, a traditional Japanese dish made from fermented soybeans, is particularly rich in K2, especially in the MK-7 form. Other sources include some aged cheeses, eggs, and certain animal-based foods like liver.
For individuals following a plant-based diet, obtaining sufficient vitamin K2 can be more challenging due to its limited presence in plant foods. Fermented plant-based products and appropriately regulated supplements can help support intake where needed.
While no official recommended daily intake for vitamin K2 has been established in the EU, some national guidelines suggest an intake of 90–120 micrograms for adults, similar to that for vitamin K1. Individual needs may vary depending on diet, lifestyle, and overall health status.
If you’re unsure whether you’re meeting your needs for vitamin K2, consulting a qualified healthcare or nutrition professional is recommended. They can provide tailored advice to help support a balanced and nutrient-rich diet.
Side Effects and Precautions
Vitamin K2 is generally well-tolerated when consumed as part of a balanced diet or within recommended amounts from supplements. Reported side effects are uncommon, but some individuals may experience mild gastrointestinal symptoms such as nausea or stomach discomfort.
Importantly, vitamin K interacts with certain medications, especially anticoagulants (blood thinners) like warfarin. If you are taking any prescription medication, particularly those that affect blood clotting, you should consult your doctor before using vitamin K2 supplements. This helps ensure that your intake is safe and appropriate for your individual health needs.
While adverse effects are rare, individual responses to supplements can vary. If you are unsure about your vitamin K2 intake or supplement choice, it is advisable to speak with a qualified healthcare professional. This supports informed decision-making and helps tailor intake to your personal circumstances.
Frequently Asked Questions
What are the main dietary sources of vitamin K2?
Vitamin K2 is found in fermented foods such as natto (fermented soybeans), certain aged cheeses, eggs, and some meats like liver. People following plant-based diets can consider fermented plant foods or appropriately regulated supplements as additional sources.
Is it safe to take vitamin K2 supplements?
Vitamin K2 is generally considered safe when taken at appropriate doses. However, individuals using blood-thinning medications should always consult their healthcare provider before starting any vitamin K2 supplement, due to potential interactions.
How does vitamin K2 support bone health?
Vitamin K2 contributes to the maintenance of normal bones by supporting the activation of proteins involved in calcium transport. This is an authorised health claim under EU regulations. Research continues to investigate its broader roles in skeletal health.
Conclusion
Vitamin K2 contributes to the maintenance of normal bones and supports normal blood clotting. It works synergistically with vitamin D3 in the body’s calcium metabolism processes. By learning about dietary sources and intake considerations, you can make informed choices to help support your nutritional needs.
Including vitamin K2 through food or supplements—where appropriate—can play a role in maintaining long-term health and well-being as part of a balanced lifestyle.
Take a proactive approach and explore how vitamin K2 can support your nutritional goals.
Sources
- Vitamin K2 | Stichting Orthokennis
- Vitamin K2 – Unique Activities for Health | NPN
- Vitamin K2 and Cardiovascular Disease
- Treatment with Vitamin K2 and Magnesium – Guidelines Database
- Vitamin K2 Restores Vascular Elasticity – Nieuws voor Diëtisten
- Vitamin D and Vitamin K2 – Orthokennis.nl
- All You Need to Know About Vitamin K2 – Healthline
- Vitamin K and Heart Health – IVG-info.nl
- All About Vitamin K2 (MK-7) – Perfect Health
*This content is for informational purposes only and does not substitute professional medical advice. Always consult a qualified healthcare provider before making changes to your supplement or medication regimen.