Key takeaways
- The endothelium lines every blood vessel.
- It makes nitric oxide.
- Dysfunction is an early warning sign.
- Exercise strengthens it.
- Polyphenols support it.
If you laid out all the endothelial cells in an adult body, they would cover an area roughly the size of a tennis court. This hidden organ plays a central role in heart health.
What the endothelium does
Controls vessel tone
It releases nitric oxide to relax vessels and other substances to constrict them, adjusting blood flow moment by moment.
Keeps blood flowing smoothly
A healthy endothelium helps prevent unwanted clotting and keeps blood cells from sticking to vessel walls.
Acts as a barrier
It controls what passes from the blood into the vessel wall, including fats and immune cells.
What helps and what harms
| Harms the endothelium | Supports the endothelium |
|---|---|
| Smoking and vaping | Not smoking |
| High blood pressure | Healthy blood pressure |
| High LDL cholesterol and blood sugar | Balanced diet, healthy weight |
| Sitting for long periods | Regular aerobic exercise |
| Ultra-processed food, excess salt | Vegetables, fruit, olive oil, fish |
| Chronic stress, poor sleep | Stress management, 7–9 hours' sleep |
Nutrients studied for endothelial health
Researchers have looked at L-citrulline and L-arginine for nitric oxide production, and at polyphenols from cocoa, grapes, berries and pine bark for their antioxidant effects on the vessel lining. Vasoryn combines L-citrulline with French maritime pine bark and grape skin extracts to support healthy endothelial function and flexible arteries.
Sources
- Widlansky M.E. et al. – "The clinical implications of endothelial dysfunction," Journal of the American College of Cardiology, 2003.
- Deanfield J.E. et al. – "Endothelial function and dysfunction: testing and clinical relevance," Circulation, 2007.
- Rohdewald P. – "A review of the French maritime pine bark extract (Pycnogenol)," International Journal of Clinical Pharmacology and Therapeutics, 2002.
Common questions
What is the endothelium?
The single layer of cells lining the inside of all blood vessels.
What is endothelial dysfunction?
When the vessel lining no longer relaxes vessels and controls blood flow properly.
How can I improve endothelial function?
Exercise regularly, don't smoke, eat plenty of vegetables and polyphenol-rich foods and sleep well.