Vitamin K2: Does It Lower Cholesterol and Arterial Calcification?
Prominent American cardiologist Dr. Elizabeth Clodfelter stated that many of her patients frequently ask her about vitamin K2, which is marketed commercially as beneficial for heart health, specifically inquiring whether it truly supports lowering cholesterol and slowing the calcification of coronary arteries, usually in conjunction with vitamin D. Dr. Clodfelter emphasized that the clinical evidence available to date has not kept pace with the marketing momentum surrounding this dietary supplement.
While noting that vitamin K2 contributes to activating certain proteins in the body, including one that helps keep calcium away from blood vessel walls—a hypothesis underpinning marketing campaigns promoting it as a means to slow calcium accumulation in heart arteries—she stressed that a scientifically plausible hypothesis does not equate to clinically proven treatment.
In response to a question about whether vitamin K2 lowers cholesterol, Dr. Clodfelter reported that the evidence is weak and contradictory, citing a systematic review that showed no real impact on cholesterol levels. She clarified that ingredients supported by robust clinical evidence for lowering cholesterol include soluble fiber, plant sterols, and omega-3 fatty acids.
Dr. Clodfelter reviewed two recent clinical trials on coronary artery calcification. The first, known as “Trevasc-HDK,” tested vitamin K2 in kidney patients prone to high levels of vascular calcification. Although the vitamin altered a laboratory marker associated with it, it did not slow calcium accumulation in the arteries or improve clinical outcomes. The second trial, published in a specialized cardiology journal in 2023, tested the vitamin in elderly men with significant coronary calcification and concluded with a neutral result, showing no clear benefit.
Dr. Clodfelter highlighted a point often overlooked in discussions about K2: removing calcium from arterial plaque is not necessarily beneficial. The body reinforces weak areas with calcium as a type of support to prevent collapse, making calcified plaque more stable and less prone to rupture, while the real risk lies in adjacent unstable soft plaque.
Dr. Clodfelter advised those with elevated coronary artery calcification to focus on scientifically proven strategies, primarily controlling cholesterol, blood pressure, blood sugar, and physical activity, and to consult a doctor about the need for medication, rather than spending time and money on supplements whose efficacy has not yet been proven by clinical trials.
