Vitamin K, found in leafy greens, fermented foods and some animal products, plays a key role in clotting and may also support stronger bones and healthier arteries.
By yourNEWS Media Newsroom
Vitamin K is an essential fat-soluble nutrient best known for its role in blood clotting, but research cited in the provided materials also points to its importance in bone strength, calcium regulation and cardiovascular health.
The National Institutes of Health identifies vitamin K as necessary for normal blood clotting and bone health. The nutrient was first recognized in the 1920s by Danish researcher Henrik Dam, according to Tieraona Low Dog in the book “Fortify Your Life.” Dam observed that chickens fed a cholesterol-free diet developed bleeding problems. When the birds were given alfalfa, spinach, cabbage or liver, the condition reversed. He named the substance vitamin K, drawing from the German word for coagulation.
Vitamin K occurs naturally in two main forms: vitamin K1, also known as phylloquinone, and vitamin K2, also known as menaquinone. Vitamin K1 is found primarily in green leafy vegetables and is closely tied to blood clotting. Vitamin K2 includes forms such as menaquinone-4 and MK-7 and is associated with bone and cardiovascular health, according to the provided Mercola.com material.
The body uses vitamin K to activate proteins involved in clot formation and calcium regulation. That calcium-related function has drawn increasing attention because of vitamin K’s potential role in helping direct calcium into bones and away from arteries.
Research from the United Kingdom and Australia, reported by NaturalNews.com and published in Bone Reports in 2023, found that adequate vitamin K intake was associated with improved bone health and a lower risk of falls and fractures. The report stated that most people may need slightly more than 100 micrograms of vitamin K1 per day.
Vitamin K2 has been highlighted for its possible role in reducing fracture risk and supporting heart health. NaturalNews.com reports cited in the provided material state that adequate K2 intake may reduce fracture risk and heart disease mortality, and that K2 may help prevent arteriosclerosis and osteoporosis.
However, the body’s ability to convert vitamin K1 into vitamin K2 appears limited. Lara Pizzorno wrote in the book “Your Bones” that only about 6% of vitamin K1 from leafy greens is ultimately converted to K2. The same source noted that the body first prioritizes vitamin K1 for blood clotting before any remaining amount may be available for conversion.
Leafy greens are among the richest sources of vitamin K1. Kale, spinach, collard greens and Swiss chard provide high levels of the nutrient, according to NaturalNews.com material cited in the provided summary. Turnip greens are also a strong source. One report said boiled turnip greens provide 530 micrograms of vitamin K per half-cup, a level comparable to collard greens and higher than many more commonly promoted greens.
Vitamin K2 is found mainly in fermented foods and some animal products. Natto, a fermented soybean dish, is described in the provided Mercola.com material as one of the richest dietary sources. Smaller amounts of K2 are found in high-fat dairy products from grass-fed cows, egg yolks, liver and other organ meats, according to NaturalNews.com material cited in the summary.
Because vitamin K is fat-soluble, the body absorbs it more effectively when vitamin K-rich foods are eaten with dietary fat. Cooking methods may also affect nutrient retention. The provided material notes that steaming may preserve more vitamin K than boiling, although turnip greens and collard greens were discussed in the context of boiled servings.
Vitamin K intake requires special attention for people taking anticoagulant medications such as warfarin. According to a BrightLearn.ai book summary, warfarin works by interfering with vitamin K-dependent clotting factors, meaning sudden increases or decreases in vitamin K intake can affect how the medication works. The American Heart Association has stated that people taking blood thinners should keep their vitamin K intake consistent.
Some experts cited in the provided material argue that vitamin K insufficiency may be more common than many people realize. Dr. Cees Vermeer, described as a leading vitamin K researcher, has said nearly everyone is deficient in vitamin K, according to a Mercola.com article. The book “Vitamins and Minerals” by Kroner Zina also notes that vitamin K levels may be sufficient for normal clotting but still fall short of what may be needed for optimal bone health.
The available evidence points to food variety as an important part of maintaining vitamin K intake. Leafy greens can supply vitamin K1, while fermented foods and certain animal products can provide vitamin K2.
For most people, adding foods such as spinach, kale, collard greens, Swiss chard, turnip greens, natto, egg yolks, grass-fed dairy and organ meats may help support vitamin K status. People taking warfarin or other anticoagulants should consult a healthcare provider before making significant dietary changes, especially changes involving large increases or reductions in vitamin K-rich foods.
The research and expert commentary cited in the provided materials suggest that vitamin K should not be viewed only as a clotting nutrient. Its role in calcium regulation, bone strength and cardiovascular health has made it an increasingly important focus in nutrition research.
Source: Natural News
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