Literature

Volume 17, Issue 4. Pages 315-321 (April 2001)

Japanese fermented soybean food as the major determinant of the large geographic difference in circulating levels of vitamin K2: possible implications for hip-fracture risk

Blood 15 April 2007, Volume 109, No 8, pp. 3279-3283

Vitamin K-containing dietary supplements: comparison of synthetic vitamin K1 and natto– derived menaquinone-7.

Blood 1 April 2007, Volume 109, No7, pp. 2823-2831

Regression of warfarin-induced medial elastocalcinosis by high intake of vitamin K in rats

November 2004, 134(11):3100-5

Dietary intake of menaquinone is associated with a reduced risk of coronary heart disease: the Rotterdam Study.