Beetroot juice is the liquid extracted from raw beets (Beta vulgaris), prized mainly for its unusually high concentration of dietary nitrates, natural compounds that your body converts into nitric oxide to relax blood vessels and improve circulation. It has a deep crimson color, an earthy-sweet flavor, and has become one of the most studied functional beverages in sports nutrition and cardiovascular research over the past decade. A single 140 mL serving of concentrated beetroot juice delivers roughly 800 mg of nitrate, enough to produce measurable effects on blood pressure and exercise performance.
What’s in Beetroot Juice
Beetroot juice is nutrient-dense relative to its calorie count. A 100 mL serving of fresh juice contains around 30 calories and about 6 to 7 grams of natural sugar. Raw beetroot is a strong source of folate (109 micrograms per 100 grams, covering more than a quarter of daily needs) and potassium (325 mg per 100 grams, comparable to a small banana). The juice retains most of these nutrients, though fiber is largely lost during pressing.
The real standout is the nitrate content. Commercial beetroot juices range from roughly 400 to nearly 4,000 mg of nitrate per liter, a wide spread that depends on growing conditions, beet variety, and how the juice is processed. Concentrated “shots” sold for athletic use tend to sit at the higher end of that range, while diluted juices or powders can fall well below effective levels. The pigments responsible for the deep red color, called betalains, also act as antioxidants, though nitrate content drives most of the researched health benefits.
How Nitrates Work in Your Body
When you drink beetroot juice, the nitrates travel to your stomach and get absorbed into your bloodstream. A portion circulates back to your salivary glands, where bacteria on your tongue convert nitrate into nitrite. That nitrite then enters your stomach and bloodstream again, where it’s further reduced into nitric oxide, a gas that signals blood vessel walls to relax and widen.
This process is sometimes called the “enterosalivary pathway” because it loops between your gut and mouth. It’s a backup route for producing nitric oxide that doesn’t depend on the enzyme your body normally uses. That matters because enzyme-based nitric oxide production tends to decline with age and in people with cardiovascular risk factors, making dietary nitrate from beets especially relevant for older adults. Plasma nitrate levels typically peak about two to three hours after drinking beetroot juice, which is why timing matters if you’re using it before exercise or an event.
Blood Pressure Effects
The blood pressure research on beetroot juice is surprisingly consistent. Clinical trials have found reductions in systolic blood pressure (the top number) ranging from about 4 to 10 mmHg within a few hours of drinking a nitrate-rich dose. One trial in healthy men showed a 4.9 mmHg drop in systolic pressure six hours after a single serving. Another found reductions as large as 10 mmHg systolic and nearly 5 mmHg diastolic at the three-hour mark. Higher nitrate doses appear to produce larger effects: one study using 5.7 mmol of nitrate in beetroot juice observed drops exceeding 20 mmHg systolic compared to water, with a double dose producing even greater reductions.
These effects are temporary after a single serving but can be sustained with daily intake. Research indicates that at least four to six consecutive days of consuming more than 300 mg of nitrate per day is needed to build up enough bioavailability for lasting physiological changes. Products with very low nitrate content (around 1 mmol per serving) have failed to produce significant blood pressure reductions in studies, so the dose matters considerably.
Exercise and Athletic Performance
Beetroot juice became popular in endurance sports after early studies showed it could reduce the oxygen cost of exercise, essentially making the same effort feel easier. The mechanism ties back to nitric oxide: better blood flow delivers more oxygen to working muscles, and nitric oxide may also improve how efficiently mitochondria use that oxygen.
The Australian Institute of Sport classifies beetroot juice as a Group A supplement, meaning it has strong enough evidence to recommend for specific athletic situations. Their guidelines suggest 350 to 500 mg of nitrate (roughly 6 to 8 mmol) consumed two to three hours before exercise. Taking more than about 10 to 12 mmol appears to offer no additional benefit over the standard dose.
Results are more reliable in recreational athletes and moderately trained individuals. Elite athletes, who already have highly efficient cardiovascular systems, tend to see smaller or less consistent improvements. The benefits also show up more clearly in activities lasting between a few minutes and about 30 minutes, where oxygen delivery is a limiting factor, rather than in very short sprints or ultra-endurance events.
Brain Health and Blood Flow
The same vasodilation that lowers blood pressure also increases blood flow to the brain. Research in older adults has shown that beetroot juice acutely improves blood flow to the frontal lobe’s white matter, the region involved in executive function, decision-making, and working memory. Studies have also found that beetroot juice can modulate blood flow to the prefrontal cortex during cognitive tasks, with some improvement in task performance.
This line of research is particularly relevant for aging populations, where reduced cerebral blood flow contributes to cognitive decline. The idea is straightforward: if nitric oxide production naturally decreases with age, a dietary source of nitrate could partially compensate and help maintain adequate brain perfusion.
Side Effects and Risks
The most noticeable side effect is beeturia, the appearance of pink or red urine after consuming beets. This is harmless and affects 10% to 14% of the general population. The rate climbs to about 45% among people with pernicious anemia or iron deficiency, because lower iron levels reduce the body’s ability to break down the red pigments during digestion. Stool color can also change temporarily.
A more significant concern is oxalate content. Beetroot juice contains 60 to 70 mg of total oxalate per 100 mL, among the highest of any fruit or vegetable juice. Drinking 500 mL or more daily can substantially increase your body’s oxalate load, which raises urinary oxalate excretion even in healthy people. For anyone with a history of calcium oxalate kidney stones, this is worth paying attention to. Dietary oxalate may contribute up to 50% of urinary oxalate levels, making high-volume beetroot juice consumption a genuine risk factor for stone formation in susceptible individuals.
Beetroot juice can also interact with the blood pressure lowering effects of certain medications. If you’re already on treatment for hypertension, the additive drop could cause lightheadedness or dizziness, particularly in the two to six hour window after drinking it.
How to Get an Effective Dose
Not all beetroot products deliver the same amount of nitrate. Concentrated beetroot juice shots (typically 70 to 140 mL) are designed to pack 6 to 8 mmol of nitrate into a small volume. Diluted juices, powders, and whole beet supplements vary enormously, with some commercial products containing as little as 1 mmol per serving, well below the threshold for measurable effects.
If you’re drinking beetroot juice for blood pressure or exercise benefits, look for products that guarantee at least 5 to 6 mmol (roughly 300 to 400 mg) of nitrate per serving. For acute exercise performance, the optimal dose appears to be around 140 mL of concentrated juice providing approximately 800 mg of nitrate, consumed two to three hours before activity. For general cardiovascular benefits, consistent daily intake over at least four to six days appears necessary to see sustained results.
One practical note: antibacterial mouthwash can blunt the effects of beetroot juice by killing the oral bacteria responsible for converting nitrate to nitrite. If you’re using beetroot juice strategically, avoid mouthwash in the hours surrounding consumption.