While Vitamin K2 is best known for its role in blood clotting, its biology extends well beyond coagulation. By activating a network of vitamin K–dependent proteins, vitamin K2 helps support calcium metabolism, contributes to healthy vascular and bone function, positioning it as a nutrient of emerging interest in cardiovascular health. 1
This has prompted a compelling question for cardiovascular researchers: why do some arteries remain flexible and resilient over time, while others quietly become stiffer, even in people who share similar traditional risk factors?
Emerging evidence may point to vitamin K2–dependent proteins in the vessel wall, such as matrix Gla protein (MGP), suggesting that vitamin K2 status may be more influential in how vessels function in the body. 2
How Healthy Arteries Function
Healthy arteries are dynamic, flexible tubes that cushion each heartbeat and deliver blood smoothly throughout the body. To understand their “health,” it helps to look at both how they work (function) and what they look like on imaging (structure).
Arterial function is commonly assessed with carotid–femoral pulse wave velocity (cfPWV), which measures how quickly the pressure wave travels between the carotid and femoral arteries. Lower cfPWV reflects more elastic, better‑cushioning arteries, while higher values indicate stiffer vessels and reduced ability to buffer each heartbeat.
Arterial structure is typically evaluated with imaging, such as coronary artery calcification (CAC) scoring and CT assessment of coronary stenosis. These measures show how much calcium and plaque have accumulated , but they do not fully capture how flexible or stiff the arteries are in real time. 3
The Influence of Nutrition on Vascular Health
Targeted nutrition is increasingly recognized as one way to support vascular health, with dietary patterns and specific nutrients as part of a multifactorial and lifestyle approach for cardiovascular health and function.
Vitamin K–dependent proteins link nutrition with these vascular processes. Matrix Gla protein (MGP), produced in the arterial wall, requires adequate vitamin K to become fully active and act as a local inhibitor of inappropriate calcium deposition. When vitamin K status is suboptimal, inactive dp‑ucMGP levels rise and have been associated with greater arterial stiffness, suggesting that vitamin K biology may be tightly connected to functional elasticity than to all aspects of structural atherosclerosis.1
Emerging Evidence: The 20-year Inter99 Study Reflects Long Term Vitamin K Status on Vascular Health
In a 20‑year population follow‑up within a cohort of older adults, investigators examined vitamin K status using plasma dp‑ucMGP, a biomarker that rises when vitamin K availability is low. They collected detailed information on dietary habits, alcohol use, smoking, leisure‑time activity, anthropometrics, blood pressure, lipids, HbA1c, kidney function, and genotyping, alongside cardiac CT imaging and comprehensive vascular phenotyping.
How Vascular Health was Measured and What They Found
Vascular health was evaluated from two complementary angles: arterial function via carotid–femoral pulse wave velocity (cfPWV), the gold‑standard measure of arterial stiffness, and arterial structure via coronary artery calcification (CAC) and coronary stenosis on CT.
Arterial function test results showed participants with lower vitamin K status had significantly higher cfPWV, even after adjusting for age, sex, blood pressure, kidney function, and other major risk factors.
Theoretically and consistent with previous studies, these results suggest vitamin K’s potential influence in vascular elasticity.
The arterial structural test, however, the picture was different.
Vitamin K status showed no significant association with CAC or with obstructive coronary stenosis. In summary, lower vitamin K did not automatically translate into more calcified plaque or narrowed coronary arteries at that time point.
The study’s strengths include its multifaceted assessment of vascular health, robust biochemical and imaging data, and the ability to explore associations in both general and higher‑risk subgroups, while its cross‑sectional design and potential over adjustment by covariates highlight important limitations for causal interpretation. 1
Vitamin K2, Vascular Function, and the Evolving Role of Targeted Nutrition
Vitamin K and its dependent proteins continue to illustrate the complexity of vascular biology, with the current findings supporting ongoing research into how vitamin K–dependent pathways may contribute to vascular function within a broader, multi-factorial approach to cardiovascular health. At the same time, these observations do not diminish the established role of coronary artery calcification as a marker of cardiovascular risk; instead, they suggest that vitamin K may support vascular health through multiple mechanisms, including arterial stiffness and functional elasticity.
For the nutraceutical industry, this study strengthens the emerging vascular function story around vitamin K and the evolving nutrition science in this area which may provide strong evidence-based formulations positioned to help support vascular health, alongside cardiovascular management strategies.1-4
