Vitamin K Reverses Arterial Stiffness
Healthy arteries expand and contract smoothly with each heartbeat.
With age, soft tissues such as arteries stiffen and lose youthful flexibility.
The phrase “hardening of the arteries” describes loss of arterial elasticity and obstructed blood flow. This “hardening” is an important predictor of heart attack and stroke.1-3
In severe cases, the aortic artery becomes so stiff and brittle that it cannot be repaired.
This is how actress Lucille Ball died. She suffered a dissecting aortic aneurysm that surgeons spent many hours repairing. They replaced her aortic valve and five inches of her upper aortic artery. It was too risky to attempt to replace her entire aortic artery. One week later Lucy died from a second rupture in her lower (abdominal) aorta.4
Lucy, with her incredible fame and fortune, perished from the structural failure of the largest artery (the aorta) in her body.
Arterial stiffness is associated with increased risk of cardiovascular disorders, dementia, and death.5-11 When the aorta stiffens, it elevates blood pressure as the heart must pump harder to force blood through the body.
Factors that contribute to arterial stiffness include inflammation, glycation, hypertension, and poor glucose control.12-15
A less understood cause of arterial stiffening is calcification.16
In 1999, we published a report on the importance of consuming high-dose vitamin K to block calcium infiltration into our soft tissues.17
Over the years we received many calls asking if higher dose vitamin K2 could reverse vascular calcification. Until recently, we did not know the answer.
In 2007, an animal study demonstrated significant reduction of arterial calcification in response to vitamin K supplementation.18 While intriguing, we did not know if this would work in people.
A landmark clinical trial using a long-acting form of vitamin K2 has demonstrated significant reductions of arterial stiffening in humans.19
This provides us all with an opportunity to restore more youthful flexibility to aging blood vessels and other soft tissues.
Modern medicine combined with healthier lifestyles has enabled maturing people to postpone the time when they suffer vascular-related disorders.
Protection against coronary artery occlusion can be achieved in mid-life via control of lipids, glucose, and pro-inflammatory factors.20-24
As people age past 65 years, however, the cumulative buildup of soft-tissue calcification sharply elevates incidence of stroke, heart failure and aortic valve stenosis.1,2,25-28
Heart Valve Disorders
Each year more than five million Americans are diagnosed with heart valve disorders.29
Without treatment, about 50% of those with symptomatic aortic stenosis will die within two years.30
While drugs known as ACE inhibitors (angiotensin-converting enzyme inhibitors) may slow progression of early-stage aortic valve stenosis, surgical interventions are the only way to treat advanced aortic stenosis.31,32
People with surgically-replaced aortic valves often require lifelong anticoagulant drugs to reduce ischemic stroke risk.33
A more rational approach to reduce the epidemic of vascular disorders facing the elderly is to block soft-tissue calcification starting earlier in life. This is readily accomplished with low-cost vitamin K2 supplements.
While it’s never too late to impede soft-tissue calcification, the dilemma facing aging humans is how to reverse arterial stiffness that occurred before the importance of taking vitamin K was recognized.
Measuring Arterial Health
Calcification inflicts severe injury to arteries and heart valves.36-38 The pictures on this page show deformed calcified aortic valves.
Observational studies show lower prevalence of coronary disease and arterial calcification in those with higher intake of vitamin K2.39-42
The “gold standard” for measuring regional arterial stiffness is the “carotid-femoral pulse wave velocity” test.43,44
People who score poorly on this test have higher rates of cardio-vascular diseases.
Reversing Arterial Stiffness
A clinical trial was designed using carotid-femoral pulse wave velocity as one of the tests to evaluate the effects of supplementing with 180 mcg a day of a long-acting form of vitamin K2 (MK-7).19
This randomized, placebo-controlled study was comprised of 244 postmenopausal women aged 55-65 years. Baseline tests of arterial stiffness were performed and the tests repeated yearly for three years.
At the end of three years, otherwise healthy postmenopausal women in the vitamin K2 group experienced a statistically significant 5.8% reduction in the stiffness index beta, a parameter for arterial stiffness, and a 3.6% reduction in carotid-femoral pulse wave velocity. The placebo group had a slight increase of 1.3% in the stiffness index and a 0.22% increase in carotid-femoral pulse wave velocity.19
The benefit was conferred upon the women with a higher baseline index of arterial stiffness in comparison with those women with lower baseline levels of arterial stiffness. This suggests that those postmenopausal women with more advanced atherosclerosis derive more benefit with vitamin K2.
This is the first long-term human trial showing improvements in measures of arterial stiffness in response to long-acting vitamin K2. While the 5.8% and 3.6% improvements might not appear substantial, when realizing that calcification often worsens with age, the fact that there was a reversal in arterial stiffness compared to placebo is quite remarkable.
This study helps support population-based studies associating higher intake of vitamin K2 with reduced cardiovascular incidence and mortality.39,42,45
Importance of Calcium Balance
Calcium is essential to sustain life.
Without sufficient calcium, we would not be able to maintain the electrolyte balance needed for proper rhythmic heart beats.46 If one were to deplete their bloodstream of calcium, they would die from a heart attack caused by an acute arrhythmic disorder.47
In a healthy body, 99% of calcium is stored in bone where it provides structural support.48 The amount of calcium allowed into the bloodstream is tightly controlled.49
In our bones, vitamin K2 activates proteins that beneficially bind calcium to bone.50 Human populations with high dietary intake of vitamin K2 have lower rates of osteoporosis.51-56
How K2 Prevents Vascular Calcification
Vitamin K activates your body’s ability to store calcium in the bone (where it belongs) and blocks it from infiltrating soft tissues.42,45,56
To visualize how vitamin K2 protects against calcification, just imagine a protein lining your vascular system that allows calcium in or out. The factor that regulates whether this protein is turned “on”—meaning it blocks calcium infiltration—is vitamin K2.
Vitamin K2 activates matrix GLA proteins in soft tissues to keep calcium out.40,42 On the flip side, K2 activates calcium-binding proteins in bone to maintain skeletal density.50
In the absence of vitamin K, bony structures form in soft tissues. Early pathologists discovered that arteries that are soft and pliable in youth often turned to stone in the elderly.57
Modern findings demonstrate the power of vitamin K, or lack thereof, to control whether we maintain strong bone density and soft pliable tissues, or develop osteoporosis together with vascular calcification.
The take home lesson as it relates to healthy blood flow is:
Matrix GLA Protein + Vitamin K2 = Barrier against calcium infiltration
Matrix GLA Protein – Vitamin K2 = Vascular/soft tissue calcification
Where We Stand Today
Most adults probably suffer some degree of calcification, as intake of vitamin K2 in Western societies remains at low levels.
A study published in 2007 tested vitamin K1 and the MK-4 form of vitamin K2 on rats.18
In the groups receiving high-dose vitamin K1 or K2 (MK-4), not only was there no further arterial calcium accumulation, there was a 37% reduction of previously accumulated arterial calcification after six weeks. After 12 weeks, there was a 53% reduction in accumulated arterial calcium deposits.
The groups receiving the high-dose vitamin K1 and K2 also showed a reversal in carotid artery stiffness. This study provided intriguing evidence that vascular calcification may be reversible by high vitamin K intake.18
When we reported on this study, we postulated that people taking vitamin K supplements over an extended time period “might” induce a regression of arterial calcification. We emphasized, however, that “more human research is needed to establish this.”
That human research has now demonstrated (for the first time) a significant improvement in arterial health in postmenopausal women with higher arterial stiffness who supplement with a modest dose of vitamin K2.19
This study also demonstrated a favorable 50% decrease in a marker of a calcium-blocking protein in the K2 supplemented group compared to placebo.19 Previous studies show that people with higher levels of this circulatory marker (uncarboxylated matrix GLA protein) have elevated rates of chronic kidney disease and heart failure.58-60
For those who like technical details, vitamin K2 is essential for the enzyme that “carboxylates” the matrix GLA protein. When matrix GLA is “carboxylated,” it shields arteries from calcium infiltration. Uncarboxylated matrix GLA, on the other hand, facilitates vascular calcification.58-60
In the new human study described in this article, a modest dose of vitamin K2 reduced uncarboxylated matrix GLA by 50%, which is an indicator of improved cardiovascular health.19
What are Ideal Vitamin K Supplements?
A review of the published scientific literature provides a rationale for aging people to supplement with three different forms of vitamin K. These include vitamin K1, vitamin K2 (MK-4), and vitamin K2 (MK-7).40,45,61
Since vitamin K is fat-soluble, taking it with the fattiest meal of the day will augment absorption into one’s bloodstream.
Some may ask why not take just the MK-7 form of vitamin K2 since this has long-acting effects in the body and has demonstrated powerful calcium-blocking properties.
Our response is that vitamin K1 and MK-4 have demonstrated impressive results in other studies, so it is best to take a formula that contains all three forms of vitamin K.
Interestingly, the MK-4 form of vitamin K2 has been used in very high doses as a prescription drug in Japan to treat osteoporosis.62
Since vitamin K1 and MK-4 are inexpensive, it makes sense to include them with long-acting MK-7 vitamin K2 to inhibit and possibly reverse as much vascular calcification as possible, while providing support for strong bones.
Potential to Spare Millions of Lives
An enormous body of published evidence indicates that common degenerative illnesses striking aging humans may be prevented by taking sufficient potencies of the proper forms of vitamin K.
Yet most physicians don’t understand vitamin K’s critical role of blocking calcification of heart valves, arterial linings, and other soft tissues, while keeping calcium in bone where it is needed.
Eye-opening studies shed light on the importance for people of all ages to optimize their intake of vitamin K to protect against soft tissue calcification.
An urgent need exists to convey this information to the medical community. This may not happen any time soon because vitamin K is sold as a low-cost dietary supplement and not an expensive prescription drug.
For longer life,
William Faloon, Co-Founder
Life Extension Buyers Club
By William Faloon