Known to work

The health benefits of Vitamin K - 2015 Open Heart BMJ Journals
Comparison of menaquinone-4 and menaquinone-7 bioavailability in healthy women - 2012 Nutrition Journal
Vitamin K2 for bone health. Vitamin K2 - a key factor for optimal bone health at all ages - 2015 Kappa Bioscience AS
Bioavailability and chemical/functional aspects of synthetic MK-7 vs fermentation-derived MK-7 in randomised controlled trials - 2016 Kappa Bioscience; University of Oslo
Foods, fortificants, and supplements: where do Americans get their nutrients? - 2011 Nutrition Impact LLC

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