Vitamin K2: Its role and benefits

Vitamin K is a fat-soluble vitamin that plays an essential role in the blood clotting process. In addition to its anticoagulant function, there is another form of vitamin K, vitamin K2, which is also important for health.

Also known as menaquinone, vitamin K2 is an essential nutrient that plays a crucial role in bone and cardiovascular health. Although it is often considered a lesser-known vitamin, research has shown that vitamin K2 can have significant health benefits.

What is vitamin K2?

Vitamin K2 is a fat-soluble vitamin that plays an important role in bone and blood vessel health. It belongs to a family of compounds known as quinones, which have antioxidant properties and are involved in energy production in cells.

It is naturally produced by organisms present in the intestine, but can also be obtained from animal and plant-based foods. Animal sources of vitamin K2 include liver, milk and dairy products, eggs, and meat.

Plant sources include leafy green vegetables, such as spinach and kale, as well as seaweeds and fermented foods, such as natto, a traditional Japanese fermented soybean food.

What are the benefits and indications of vitamin K2?

Involved in the regulation of calcium metabolism, an essential mineral for bone density, as well as in the regulation of blood clotting, vitamin K2 is of paramount importance in the functioning of the human body. Here are some of its many benefits.

Benefits for bone health

Vitamin K2 is known for its role in bone health. It helps regulate calcium metabolism by activating the production of proteins (osteocalcins) that bind calcium in the bones and by reducing its presence in the arteries, where it can contribute to plaque buildup.

Studies have shown that taking vitamin K2 supplements can reduce the risk of fractures in people with osteoporosis and can increase bone mineral density in postmenopausal women.

Benefits for cardiovascular health

Vitamin K2 is of great importance for cardiovascular health. It helps regulate blood clotting by activating proteins involved in this process and preventing the accumulation of platelets in the arteries. Taking vitamin K2 supplements can reduce the risk of arterial calcification, which is a risk factor for cardiovascular diseases.

Benefits for people with chronic kidney disease

Taking vitamin K2 supplements may also be beneficial for people with chronic kidney disease. Patients with chronic kidney disease often have a vitamin K2 deficiency, which can contribute to calcium buildup in the arteries and an increased risk of cardiovascular disease.

Indications for taking vitamin K2 supplements

Taking vitamin K2 supplements may be indicated in cases of vitamin K2 deficiency. People following a vegan diet or having impaired intestinal absorption are particularly at risk of vitamin K2 deficiency. People with certain gastrointestinal diseases, such as celiac disease and Crohn's disease, may also have reduced absorption of vitamin K2.

Studies have also shown that taking vitamin K2 supplements can be beneficial for people with type 2 diabetes. Vitamin K2 can help improve insulin sensitivity and reduce the risk of diabetes-related complications, such as cardiovascular disease.

Recommended dosage of vitamin K2

The recommended dosage of vitamin K2 depends on several factors, including age, sex, and general health. Recommended doses generally range between 45 and 200 micrograms per day for adults. It is important to note that vitamin K2 can interact with certain medications, particularly anticoagulants. People taking anticoagulants should avoid taking vitamin K2 supplements without consulting their doctor.

Where to find vitamin K2 in food?

Vitamin K2 can be obtained from animal and plant-based foods, but the amount of vitamin K2 varies depending on the food sources.

Animal sources of vitamin K2

Animal sources of vitamin K2 include liver, milk and dairy products, eggs, and meat. Chicken liver and veal liver are the best sources of vitamin K2 among animal-derived foods.

Whole milk and dairy products, such as cheese, butter, and yogurt, also contain small amounts of vitamin K2. Eggs, especially the yolk, are another source of vitamin K2. Finally, meat, especially red meat, is a source of vitamin K2.

Plant sources of vitamin K2

Plant sources of vitamin K2 include leafy green vegetables, seaweeds, and fermented foods, such as natto, a traditional Japanese fermented soybean food. Leafy green vegetables, such as spinach and kale, contain small amounts of vitamin K2, but they are often less bioavailable than animal sources of vitamin K2.

Seaweeds, such as kombu and wakame, are also a source of vitamin K2. Finally, natto is a particularly rich source of vitamin K2, with about 1000 micrograms of vitamin K2 per serving.

What are the risks of vitamin K2 overdose?

Like all vitamins, an overdose of vitamin K2 can lead to adverse effects. Symptoms of a vitamin K2 overdose may include nausea, vomiting, dizziness, abdominal pain, diarrhea, and itching.

In more severe cases, an overdose can cause hemolytic anemia (a disease that destroys red blood cells) and liver damage. It is important to note that vitamin K2 is stored in the liver, which can lead to an accumulation of the vitamin in the body in case of overdose.

It is therefore recommended not to exceed the recommended daily dose of vitamin K2. If you are taking vitamin K2 supplements, it is advisable to consult your doctor to find out what the appropriate dose is for you based on your age, health status, and individual vitamin needs.

Vitamin K2: In summary

In conclusion, vitamin K2 is an essential nutrient that can offer many health benefits. By including foods rich in vitamin K2 in your diet and discussing your vitamin needs with your doctor, you can ensure adequate vitamin K2 intake and maintain good bone, cardiovascular, and overall health.

If you are concerned about your vitamin K2 intake, talk to your doctor or a healthcare professional to determine if you need to take supplements or if you can increase your dietary intake of vitamin K2.