Vitamin K1 and K2, They Are the Same, Right? | JASE Medical

There is confusion surrounding vitamin K. We know vitamin K as the clotting vitamin, found in large amounts in leafy green vegetables. When someone is on blood thinners they are usually cautioned about their intake of greens and how it can interfere with the effectiveness of the medication. But did you know there is a vitamin K1 and K2?

There are two forms of vitamin K, K1 and K2

Vitamin K is the generic name for a family of similar compounds that are fat soluble, are found in food and are also found in supplement form. These compounds include phylloquinone (vitamin K1) and a series of menaquinones also known as MKs (vitamin K2). Vitamin K2 can be divided into subtypes: short-chain (i.e., menaquinone-4; MK-4- most bioavailable) and long-chain (MK-7, MK-8, and MK-9)

Vitamin K1 is found in spinach, cabbage, and kale. K1 can also be found in fruits like avocado, kiwi and grapes. Absorption of K1 is increased when eaten with fat, such as butter or oils.

Vitamin k2 is found in fermented food (sauerkraut and vegetables), meat, and dairy. Other sources of K2 are chicken meat, egg yolks, beef and salmon. K2 is synthesized by bacteria, and a small amount is produced by the bacteria in the gut. Absorption is also increased when eaten with fats such as butter or oils.

Vitamin K1 is retained in the liver, where it assists with and works with other compounds to manufacture the body’s clotting factors. In contrast, vitamin K2, particularly long chain derivatives, are redistributed to the circulation and are available for other tissues, such as bone and vascular system.

Health benefits of both vitamin K1 and K2

Both vitamin K1 and K2 are vital to health. They work in drastically different ways and on different parts of the body. About 10-15% of vitamin K1 is absorbed by the body compared to 50% of vitamin K2. The Standard American Diet (SAD) intake of vitamin K1 is higher than K2.

Vitamin k1 health benefits

  • Assists with bleeding and bruising regulation in the body
  • Acts as an anti-inflammatory and protects against oxidative stress
  • Is a cofactor to make prothrombin ( clotting factors)
  • Precursor to K2
  • Bone health

Vitamin K2 health benefits

Factors that prevent absorption of vitamin K absorption

  • Health problems that can prevent your body from absorbing vitamin K, such as gallbladder or biliary disease, cystic fibrosis, celiac disease, and Crohn’s disease
  • Liver disease
  • Taking blood thinners, such as warfarin (Coumadin)
  • Long-term hemodialysis
  • Serious burns
  • Consumption of trans fats (k2 absorption)
  • Broad spectrum antibiotic use (k2 absorption)
  • Dilantin
  • Fat blocking medications such as Orlistat

- Brooke Lounsbury, RN

Medical Content Writer

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