As discussed in the Vitamin K Supplements Review
, higher intakes of certain forms of vitamin K2 from food are associated with a reduced risk of coronary artery calcification and mortality from coronary heart disease. These benefits have, so far, not been proven with vitamin K2 supplements, although one study showed some improvements in arterial stiffness. More information about this is found in the "What It Does" section of the Vitamin K Supplements Review
, which includes ConsumerLab.com's tests and reviews of products including those made with the MK-4 and MK-7 forms of vitamin K2.