Does Pomegranate Juice Increase Nitric Oxide?

Pomegranate juice does increase nitric oxide availability in the body, but not primarily by supplying raw materials the way beetroot juice does. Instead, pomegranate juice works largely by shielding nitric oxide from being destroyed by oxidative stress and by boosting the enzyme responsible for producing it. Lab studies show it is far more potent at protecting nitric oxide from breakdown than other antioxidant-rich juices, and clinical trials consistently link its consumption to lower blood pressure, a hallmark of improved nitric oxide signaling. The story, though, is more layered than “drink juice, get more NO,” and the size of the benefit you personally experience may depend on your gut bacteria.

How Pomegranate Juice Protects Nitric Oxide

Nitric oxide is a short-lived molecule. Once your blood vessels produce it, reactive oxygen species, especially superoxide, can neutralize it within seconds. This is where pomegranate juice stands out. In laboratory testing, pomegranate juice proved to be a powerful inhibitor of superoxide-driven nitric oxide destruction. A tiny amount of diluted pomegranate juice produced the same antioxidant shielding effect that required vastly larger volumes of blueberry juice or grape juice.¹ The practical result is that more of the nitric oxide your body already makes stays active longer, relaxing blood vessel walls and improving blood flow.

This distinction matters. Many people hear “nitric oxide booster” and think of supplements that provide building blocks like L-arginine or L-citrulline, or foods rich in dietary nitrate like beets and spinach. Pomegranate juice takes a different route. Its dense concentration of polyphenols, particularly punicalagins and ellagitannins, scavenges the free radicals that would otherwise chew through nitric oxide before it can do its job. Think of it less as turning up the faucet and more as plugging the drain.

Boosting the Enzyme That Makes Nitric Oxide

On top of its antioxidant protection, pomegranate juice also appears to increase the production side of the equation. The enzyme that generates nitric oxide inside blood vessel walls is called endothelial nitric oxide synthase, or eNOS. In areas of the vascular system where blood flow is turbulent and plaque tends to build up, eNOS activity drops. Research in cell cultures and in mice prone to atherosclerosis found that pomegranate juice concentrate reversed this decline, increasing eNOS expression in exactly the areas where it was most suppressed.² A follow-up study confirmed that a punicalagin-rich pomegranate fruit extract produced similar eNOS-boosting effects and also raised levels of cyclic GMP, the downstream signaling molecule through which nitric oxide relaxes smooth muscle in vessel walls.³

So pomegranate juice has a two-pronged effect: it helps the body produce more nitric oxide and simultaneously keeps that nitric oxide from being destroyed. Both pathways converge on the same outcome, better vasodilation and healthier blood vessels.

Pomegranate Juice Versus Beetroot Juice for Nitric Oxide

If you have looked into nitric oxide and diet, you have probably come across beetroot juice, which is loaded with inorganic nitrate. Bacteria on the tongue convert dietary nitrate into nitrite, which then converts into nitric oxide in the bloodstream. This is a fast, well-studied pathway, and beetroot juice is the gold standard for it. Pomegranate juice, by contrast, contains relatively modest amounts of nitrate. Measured concentrations come in around 13 mg per liter, a fraction of what beet or carrot juice provides.⁴

This means pomegranate juice is not a meaningful nitrate source. A study that directly compared pomegranate supplementation to beetroot juice confirmed this: plasma nitrate and nitrite levels jumped after beetroot juice but did not rise meaningfully from pomegranate alone.⁵ However, animal research in obese rats showed that both pomegranate juice and pomegranate fruit extract did raise plasma nitrate and nitrite levels.⁶ The likely explanation is that by protecting existing nitric oxide from oxidative breakdown and ramping up eNOS, pomegranate juice leads to more nitric oxide metabolites circulating in the blood, even without flooding the body with raw nitrate the way beets do.

The two juices work through genuinely different mechanisms, which raises an interesting possibility: they might complement each other. Beetroot supplies the raw material, pomegranate protects the finished product. Some researchers have explored this angle, though the evidence on combining them for exercise performance is still thin.

What the Blood Pressure Evidence Shows

Blood pressure is one of the most direct clinical readouts of nitric oxide activity, because nitric oxide relaxes arterial walls and lowers vascular resistance. Two separate meta-analyses of randomized controlled trials found that pomegranate juice consistently lowers systolic blood pressure by roughly 5 mmHg. The larger of the two pooled 14 trials and reported a reduction of about 5 mmHg in systolic pressure, with an additional drop of about 3 mmHg in diastolic pressure when consumption lasted two months or less.⁷ An earlier meta-analysis of eight trials found a similar systolic reduction and also noted a small but statistically significant diastolic decrease.⁸

A five-point drop in systolic pressure is not dramatic, but it is clinically meaningful. Epidemiological data have long suggested that even modest sustained reductions in blood pressure translate into meaningfully lower risk of stroke and heart attack over the long haul. For context, the effect size is in the same ballpark as what you might get from cutting salt intake or starting a walking routine.

One nuance worth noting: the larger meta-analysis found that the blood pressure benefit seemed to fade after two months of continuous consumption. The authors also observed a somewhat counterintuitive dose pattern, with volumes at or below about 300 mL per day showing a clearer systolic effect than higher volumes.⁷ This could reflect biological adaptation, or it could be a quirk of the trials available. Either way, the “more is better” assumption does not hold here. In a trial focused on people with type 2 diabetes, six weeks of pomegranate juice brought down both systolic and diastolic pressure compared to a control group.⁹

Blood Flow, Vessel Diameter, and Exercise

If pomegranate juice increases nitric oxide availability, you would expect to see wider blood vessels and better blood flow, and that is what several studies report. In young healthy adults, a single dose of pomegranate extract taken before high-intensity exercise led to larger vessel diameter and greater blood flow measured 30 minutes afterward.¹⁰ Another trial found that pomegranate extract taken 30 minutes before running increased both vessel diameter and time to exhaustion at high intensities.¹¹

The exercise angle is where pomegranate research gets most interesting for athletes and fitness enthusiasts. One study in trained cyclists tested pomegranate extract at both sea level and simulated high altitude. At altitude, the supplement raised plasma nitrate levels and increased oxygen uptake during high-intensity riding, though it did not improve time to exhaustion.¹² The altitude-specific benefit makes mechanistic sense: at lower oxygen pressures, any extra nitric oxide signaling that helps vessels dilate and improve oxygen delivery becomes more valuable.

Children with metabolic syndrome also showed improved vascular function after pomegranate juice. Flow-mediated dilation of the brachial artery, a standard measure of how well vessels respond to increased blood flow, improved within four hours of drinking pomegranate juice and remained elevated at one month.¹³ A study in hypertensive adults also showed a trend toward improved flow-mediated dilation after pomegranate juice, though the change fell short of statistical significance.¹⁴

Why Your Response May Differ From Someone Else’s

One of the more revealing threads in pomegranate research involves gut bacteria. The polyphenols in pomegranate juice, particularly the ellagitannins, are large molecules that are poorly absorbed on their own. They pass into the colon, where gut microbes break them down into smaller compounds called urolithins, which are then absorbed into the bloodstream.¹⁵ The catch is that not everyone’s gut flora produces the same urolithins. Human studies have identified three distinct metabolic profiles. Most people produce primarily urolithin A. A second group, somewhere between 10 and 50 percent of volunteers in various trials, also produces isourolithin A and urolithin B. And a third group, roughly 5 to 25 percent of people, produces essentially no detectable urolithins at all.¹⁶

This variation has real consequences. A randomized clinical trial in overweight and obese adults found that cardiovascular risk biomarkers improved meaningfully after pomegranate extract consumption, but only in individuals with the gut profile that produces the broader range of urolithins. That group saw drops in total cholesterol, LDL cholesterol, and oxidized LDL, while the other metabolic groups showed no significant change.¹⁷ The researchers suggested that this gut-microbiome variability could explain why pomegranate trials sometimes produce frustratingly inconsistent results. Two people drinking the same juice may be absorbing very different amounts of the bioactive metabolites.

There is no simple at-home test for your urolithin profile, and it appears to be independent of age or general health status.¹⁶ That said, the blood pressure benefits seen in meta-analyses are averages across people with different profiles, so some degree of benefit appears even when you cannot guarantee optimal metabolism.

Artery Plaque and Long-Term Vascular Health

One of the most frequently cited pomegranate studies followed patients with carotid artery narrowing who drank a small amount of pomegranate juice daily for up to three years. After one year, the thickness of their carotid artery walls, a marker of plaque buildup, decreased by up to 30 percent. In the control group that drank no pomegranate juice, the same measurement worsened by 9 percent.¹⁸ The study also found dramatically lower LDL oxidation and higher activity of paraoxonase 1, an enzyme that protects lipoproteins from oxidative damage.

Those are striking numbers, but it is worth noting that a later, larger trial in people at moderate heart disease risk found no significant overall difference in artery wall thickness progression between pomegranate juice and control groups. The benefit appeared only in a subgroup of participants who started with the worst oxidative stress and lipid profiles.¹⁹ This pattern, where pomegranate juice seems to help most in people who are already in worse shape metabolically, recurs across several lines of evidence and connects back to the gut microbiome findings mentioned above. The people who had the worst baseline cardiovascular markers also happened to disproportionately carry the gut bacteria associated with the broadest urolithin production.

Erectile Function and Nitric Oxide

Erections depend heavily on nitric oxide signaling, so pomegranate’s NO-boosting properties have naturally prompted research into erectile dysfunction. A randomized, placebo-controlled crossover trial in 53 men with mild to moderate erectile dysfunction tested daily pomegranate juice against placebo. Among the 42 participants who reported any improvement after either beverage, 25 improved after pomegranate juice. The trend favored pomegranate, but the result just missed statistical significance.²⁰ That is worth keeping in perspective. The direction of the finding is suggestive, not conclusive, and the trial was small. It would be premature to call pomegranate juice a treatment for erectile dysfunction, but the mechanism through nitric oxide protection is at least biologically plausible.

Combining Pomegranate With Other NO-Boosting Foods

Because pomegranate juice works through antioxidant protection rather than nitrate supply, researchers have looked at whether pairing it with foods that do provide nitrate or nitric oxide precursors might enhance the effect. One study examined watermelon juice, which is naturally rich in L-citrulline (an amino acid that the body converts into L-arginine and then into nitric oxide), enriched with pomegranate ellagitannins. The combination improved exercise performance more than either component alone, suggesting a synergistic effect between the citrulline pathway and the antioxidant protection provided by pomegranate polyphenols.²¹

On the other hand, adding pomegranate to beetroot juice did not improve resistance exercise performance beyond what beetroot alone provided, and it did not further raise plasma nitrate or nitrite levels.⁵ So the synergy may depend on the specific pairing. Combining pomegranate with a citrulline source (watermelon, for instance) may make more mechanistic sense than combining it with a nitrate source like beets, since citrulline feeds directly into eNOS, the very enzyme pomegranate upregulates.

Juice Versus Extract Versus Whole Fruit

Not all pomegranate products are created equal. Research has tested juice concentrates, fruit extracts rich in punicalagin, seed oil, and even the peel. In animal studies, both juice concentrate and a punicalagin-rich fruit extract boosted eNOS expression and cyclic GMP levels to a similar degree.³ Pomegranate seed oil, by contrast, did not raise plasma nitrate or nitrite levels the way juice and extract did in obese rats.⁶

The polyphenol content of pomegranate products varies considerably by cultivar, growing conditions, and processing methods. Commercial “pomegranate juices” that are blended with apple or grape juice, or made from concentrate with added sugar, will have lower concentrations of punicalagins than pure pomegranate juice or standardized extracts. If you are interested in the nitric oxide angle specifically, look for 100% pomegranate juice (not cocktails) or supplements that list punicalagin content. The exercise studies that found positive results generally used concentrated extracts equivalent to about 500-1000 mg of pomegranate polyphenols.

Drug Interactions Worth Knowing About

Pomegranate juice inhibits certain liver and intestinal enzymes, specifically CYP3A4 and CYP2C9, that metabolize a wide range of medications. In lab tests, pomegranate juice was roughly as potent as grapefruit juice at shutting down CYP3A4 activity.²² Preclinical studies have shown that prolonged pomegranate juice consumption increased blood levels of several drugs, including the blood pressure medication nitrendipine, the HIV drug saquinavir, and sildenafil (Viagra), by slowing their breakdown in the gut.²³

This matters for anyone taking medications metabolized by CYP3A4 or CYP2C9, which includes many statins, calcium channel blockers, some blood thinners, and immunosuppressants. If you are on any prescription medication and want to drink pomegranate juice regularly, bring it up with your pharmacist. The interaction is not guaranteed to be dangerous, but it can change how much drug your body absorbs, which could push levels too high or alter the drug’s effectiveness.

The Sildenafil Connection

One irony worth mentioning: sildenafil works by amplifying nitric oxide signaling in a specific tissue. Pomegranate juice both increases nitric oxide availability and slows the breakdown of sildenafil itself. In theory, that is a double amplification. In practice, it also raises the risk of side effects from too-high drug levels, like headaches or dangerous drops in blood pressure. If you are using any PDE5 inhibitor, combining it with large amounts of pomegranate juice without medical guidance is a bad idea. The interplay between pomegranate’s NO-boosting polyphenols and its enzyme-inhibiting effects on drug metabolism is a genuine pharmacological concern, not just a footnote on a label.