How Nitric Oxide Supports Healthy Blood Pressure

Nitric oxide is a signaling molecule made naturally by the cells lining your blood vessels. Its main job in the cardiovascular system is vasodilation — helping blood vessels relax and widen so blood can flow more easily. When nitric oxide production or availability declines, blood vessels lose some of that flexibility, which is one reason researchers have studied it closely in the context of healthy blood pressure.

Two ways your body makes nitric oxide

The body produces nitric oxide through an enzyme called endothelial nitric oxide synthase (eNOS). There's also a second, diet-dependent route: nitrate from food is converted by oral bacteria into nitrite, which the body can then convert into nitric oxide. This is often called the nitrate-nitrite-nitric oxide pathway, and it's the mechanism behind why nitrate-rich vegetables like beets and leafy greens are of particular research interest for cardiovascular health.

What the research shows

A randomized, double-blind trial published in the American Heart Association journal Hypertension found that four weeks of daily dietary nitrate supplementation, in the form of beetroot juice, produced sustained blood pressure reductions in patients with hypertension compared to a placebo. Earlier controlled studies from Queen Mary University of London researchers, published in the journal Hypertension and in the New England Journal of Medicine, showed that inorganic dietary nitrate lowers blood pressure acutely in healthy volunteers via its conversion to nitrite-derived nitric oxide. A more recent systematic review in Nutrition Research Reviews summarized multiple human intervention studies pointing in the same direction, while also noting that individual responses vary and that not every trial has shown a measurable effect.

What this means day to day

None of this means dietary nitrate is a substitute for medical treatment or lifestyle fundamentals like sleep, movement, and a balanced diet. It's one piece of a larger picture of cardiovascular health, alongside established approaches like the DASH dietary pattern, regular physical activity, and working with your physician on blood pressure management. If you're on blood pressure medication or blood thinners, talk to your doctor before making significant changes to your intake of nitrate-rich foods or supplements, since interactions are possible.

This article is for general educational purposes and is not personalized medical advice. These statements have not been evaluated by the Food and Drug Administration.