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USDA: “Vitamin K: Another Reason To Eat Your Greens.”
National Institutes of Health Office of Dietary Supplements: “Vitamin K,” “Vitamin K: Fact Sheet for Health Professionals.”
USDA: “Nutrient Lists.”
VA Nutrition and Food Services: “Vitamin K Content of Foods.”
UNC School of Medicine: “Vitamin K Content of Common Foods.”
Nutrients: “Health Benefits of Nut Consumption.”
Oregon State University Extension Service: “Does freezing kill vitamin K?”
Washington State Department of Health: “Health Benefits of Fish.”
Journal of Nutrition: "Intake of Fermented Soybeans, Natto, Is Associated with Reduced Bone Loss in Postmenopausal Women: Japanese Population-Based Osteoporosis (JPOS) Study."
Nattokinase Research Organization: “What is Natto?”
Harvard T.H. Chan School of Medicine: “Vitamin K.”
Reviewed by Melinda Ratini, DO, MS on October 17, 2018
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