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Vitamin K: Not Just Found In Leafy Greens

June 11, 2017: 12:00 AM EST
USDA nutrition researchers have shown that the relatively obscure vitamin K, once thought to exist only in leafy green vegetables, is also present in significant amounts in dairy products containing fat, including milk, yogurt, and cheese. Vitamin K, which helps the blood to clot, is found in two natural forms: phylloquinone, which is plant-based, and menaquinones, found in animal products and fermented foods, and produced by bacteria in the human gut. The researchers say more research is needed to determine the role of microbes used in production of dairy products, and their impact on menaquinone content. There is also a need to determine the bioavailability of all menaquinone forms, considering their abundance in the U.S. diet. [ Collard greens, image credit: © Wikimedia Commons  ]
Xueyan Fu et al., "Multiple Vitamin K Forms Exist in Dairy Foods", Current Developments in Nutrition, June 11, 2017, © Fu et al.
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