September 26, 2026 · 4 min read
Every heartbeat pushes blood through roughly 60,000 miles of blood vessels. How easily it moves depends a lot on one thing: whether those vessels can relax and widen when they need to. That is where nitric oxide comes in, and it is the main reason L-Citrulline sits at the center of the Vasoryn formula. You can see the complete formula on the Vasoryn main page.
Nitric oxide is a tiny signaling molecule made by the inner lining of your blood vessels. When it is released, it tells the smooth muscle around the vessel wall to relax. A relaxed vessel is a wider vessel, and a wider vessel lets blood flow more freely. Your body makes nitric oxide all day long, but production tends to slow with age, stress and inactivity.
L-Citrulline is an amino acid found naturally in watermelon (its name even comes from the Latin word for watermelon, Citrullus). Once absorbed, your kidneys convert it into L-Arginine, which is the raw material your blood vessels use to make nitric oxide.
Simplified illustration of a natural pathway — not a measurement of any individual result.
You might wonder why Vasoryn doesn't just include arginine directly. The answer is absorption. Much of the arginine you swallow gets broken down in the gut and liver before it ever reaches your bloodstream. Citrulline takes a smoother route, passing through to the kidneys and being converted there. Research summarized on PubMed has repeatedly looked at citrulline as an efficient way to raise arginine levels.
Citrulline doesn't work alone in Vasoryn. It shares the 570mg blend with Pine Bark Extract and Grape Extract, two polyphenol-rich botanicals traditionally used to support healthy blood vessel function, plus L-Carnitine, Maca and Saffron. Niacin and Zinc round out the formula. The idea is a daily capsule that supports circulation from several angles at once.
Because citrulline supports vessel relaxation, it can add to the effect of blood pressure medication, nitrates or ED medication. If you take any of these, talk to your doctor before starting Vasoryn, and never stop a prescribed medication on your own.
These statements have not been evaluated by the Food and Drug Administration. Vasoryn is not intended to diagnose, treat, cure or prevent any disease. Talk to your doctor before starting any supplement.
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