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Vitamin K
Established research area
A fat-soluble vitamin the body uses for normal blood clotting and bone maintenance. K1 comes mainly from leafy greens; the K2 form (from fermented and animal foods) is tracked separately here.
Commonly noted
- Commonly noted
- Vitamin K is a fat-soluble vitamin the body uses for normal blood clotting and for maintaining bone; K1 (phylloquinone) comes mainly from leafy green vegetables.
- Low intake
- Low vitamin K status is uncommon and is commonly discussed in relation to easy bruising and longer bleeding times, more likely among people with fat-absorption problems.
- Higher intake
- Vitamin K from food has not been shown to cause harm and has no established upper level; a steady, consistent vitamin K intake is a widely discussed topic for people taking the anticoagulant warfarin.
Source: NIH ODS
Reference intakes
General reference figures for a typical adult, not a personal target.
- aiadult_female90 mcgDRI/NASEM
- aiadult_male120 mcgDRI/NASEM
Foods and products containing it
CeleryFoodSwiss chardFoodPicklesFoodPlumFoodArugulaFoodWatercressFoodRomaine lettuceFoodSpinachFoodCauliflowerFoodMustard greensFoodGreen peasFoodCilantroFoodEdamameFoodBoysenberriesFoodGai lan (Chinese broccoli)FoodPearFoodPrunesFoodKaleFoodLeekFoodChivesFoodSageFoodAsparagusFoodChayoteFoodShiso (perilla)FoodEscaroleFoodMultivitaminSupplementEndiveFoodBroccoliFoodSugar snap peasFoodWakameFoodPerilla leaf (kkaennip)FoodCarrotsFoodIceberg lettuceFoodGarlic chivesFoodCabbageFoodGreens powderSupplementMung bean sproutsFoodSnow peasFoodTomatoFoodKomatsunaFoodBlackberriesFoodParsleyFoodCucumberFoodMulberriesFoodRomanescoFoodBrussels sproutsFoodPestoFoodPurple cabbageFoodNettleFoodBlueberriesFoodMizunaFoodMarjoramFoodKiwiFoodKimchiFoodGrapesFoodCollard greensFoodOkraFoodCapersFoodAvocadoFoodOreganoFoodRapiniFoodScallion (green onion)FoodNegi (Japanese bunching onion)FoodPine nutsFoodBasilFoodCeleriacFoodGherkinsFoodSauerkrautFoodParsnipFoodGreen beansFoodRhubarbFoodPomegranateFoodRadicchioFoodDandelion greensFoodThai basilFoodBok choyFoodOlive oilFoodTomatilloFoodNapa cabbageFoodAojiru green juice (supplement)SupplementWorth knowing
Vitamin K interacts with the blood-thinning medication warfarin; a steady intake is commonly discussed with a professional.