|Not this K2. Source: Kogo|
As I said above, this isn't the first time that vitamin K2 has been shown to prevent cardiovascular issues. The Rotterdam study, on 4,807 men and women over the age of 55, found that intakes of vitamin K2 over 32 micrograms was linked with a 50% reduction in deaths from cardiovascular disease, and a 25% drop in all-cause mortality rates. In another, using 16,000 people from the EPIC cohort, every 10 micrograms of dietary vitamin K2 was linked with a 9% reduction in coronary heart disease. Additionally, a randomised, controlled clinical trial tested the effects of supplementary K2 on 244 post-menopausal Dutch women for its effects on bone and cardiovascular health. These researchers found that a daily dose of 180 micrograms could improve cardiovascular health, bone mineral density and bone strength, but at least two years of supplementation was required for a clinically relevant effect.
It is important to notice the difference between vitamins K1 and K2. Vitamin K1 is found in green leafy vegetables, and was not associated with significant effects on cardiovascular health, only K2 was. The diets of people in industrialised countries do not seem to contain much vitamin K2, except for the Japanese diet where K2-rich foods such as natto (a fermented soy product) are eaten. Vitamin K2 is primarily found in organ meats, egg yolks, cheese, and of course, natto. All things we have been told to avoid for years, because of the big bad cholesterol.