 The study found that plasma levels of vitamins K1, phylloquinone, K2, menachinones, and K3, menodione, do not correlate with coronary artery calcification, CAC. The study also found that plasma levels of vitamin K1 are associated with lower levels of uncuboxylated osteocalcin, UCOC, protein induced by vitamin K absence of antagonist 2, PIVCA2, intact parathyroid hormone, IPTH, and bone-specific alkaline phosphatase, BAP. Additionally, the study found that plasma levels of vitamin K1 are positively correlated with age, creatinine, collagen type 1 cross-linked enterminal telepeptide, NTX, and pulse wave velocity, PWV. However, the study did not find any significant correlation between plasma levels of vitamin K1 and coronary artery calcification. This article was offered by S. Tori, Y. Akari, K. Tonabay, and others.