Food Sources of Vitamin K
Vitamin K1 can be found mainly in many plants. These include Brussels sprouts, broccoli, turnip greens, spinach, collard greens, and kale. Depending on the subtype, vitamin K2 can be found from different sources. A subtype called MK-4 naturally occurs in animal products, such as butter, egg yolks, and chicken. MK5 to MK-15 can be generated by bacteria and may be found in many fermented products. A Japanese dish called Natto is made from fermented soybeans is especially rich in MK-7. Some soft and hard cheeses contain vitamin K2 in the form of MK-9 and MK-8. [7]
