How Beet Juice Lowers Blood Pressure and How Much It Helps

Drinking beet juice can measurably lower blood pressure, and the effect is driven almost entirely by the inorganic nitrate beets are loaded with. A meta-analysis of eleven trials in people with hypertension found that beetroot juice reduced clinic systolic blood pressure by about 5 mmHg compared to placebo, though the effect on diastolic pressure was less consistent.¹ That number sounds modest, but a sustained drop of that size at the population level is meaningful for cardiovascular risk. The catch is that how well it works depends on your health status, what else you are doing, and even what kind of mouthwash you use.

How Beet Juice Actually Lowers Blood Pressure

Beets are among the richest dietary sources of inorganic nitrate. When you drink beet juice, that nitrate enters your bloodstream, gets concentrated in your saliva, and is then converted to nitrite by bacteria that live on your tongue. The nitrite is swallowed, absorbed, and eventually converted again into nitric oxide, a molecule that relaxes and widens blood vessels.² This process is sometimes called the enterosalivary nitrate-nitrite-NO pathway, and it works in parallel with the body’s own nitric oxide production systems.³

The critical step happens in your mouth. Specific communities of bacteria living on the back of your tongue are responsible for reducing nitrate to nitrite. Without those bacteria doing their job, the whole chain stalls. After you drink beet juice, plasma nitrite levels rise in a dose-dependent way, peaking at roughly two to three hours.⁴ Blood pressure follows that curve: in one controlled study, the largest drop in systolic pressure hit at about two and a half hours after ingestion, with diastolic and mean arterial pressure bottoming out at three hours.⁵

How Large Is the Effect?

The size of the blood pressure drop varies depending on how the study was designed, who the participants were, and whether the dose was a single serving or sustained over weeks. Single-dose studies in healthy volunteers have reported impressively sharp acute drops. One early trial found a peak systolic reduction of about 10 mmHg around two and a half hours after a single glass of beetroot juice.⁶ That is a large acute effect, and these numbers tend to be bigger than what you see with daily supplementation over time.

In longer-term trials focused on people who actually have hypertension, the numbers settle lower but remain clinically relevant. A four-week randomized trial gave 68 hypertensive patients roughly 250 mL of beetroot juice daily and found a reduction of about 8 mmHg in systolic pressure across clinic, ambulatory, and home readings, with no sign that the effect wore off over the month.⁷ When a 2024 meta-analysis pooled eleven trials and roughly 350 hypertensive patients, it found a pooled systolic reduction of about 5 mmHg, though the effect on diastolic pressure did not reach statistical significance and the results across studies were fairly heterogeneous.⁸ The meta-analysis noted that daily nitrate doses from beetroot juice ranged from about 200 to 800 mg across those trials, and the researchers found no clear sign that the effect faded with continued use.

One caveat: not every study has shown durable effects. A separate trial in older adults with hypertension found that while nitrate-rich beet juice did cause an acute systolic drop a few hours after drinking it, four weeks of daily supplementation did not produce a statistically significant sustained blood pressure reduction beyond what the placebo group also experienced.⁹ Age and baseline vascular health likely play a role in who responds and who does not.

Why Your Mouthwash Might Cancel the Benefit

This is the finding that catches most people off guard. Because the nitrate-to-nitrite conversion depends on bacteria living in your mouth, anything that kills those bacteria also kills the blood pressure effect. Strong antibacterial mouthwash is the most common culprit. In studies where volunteers used chlorhexidine-based mouthwash, oral nitrite levels dropped by roughly 90%, plasma nitrite fell by about 25%, and the blood pressure reduction from nitrate supplementation was wiped out entirely.¹⁰

The research here is consistent. At least one study specifically tested graded concentrations of mouthwash and found a stepwise reduction in both salivary and plasma nitrite as the mouthwash strength increased.¹¹ Another trial confirmed that antiseptic mouthwash abolished the blood pressure drop from dietary nitrate and also eliminated protective effects in the stomach that the nitrate pathway provides.¹² The practical takeaway: if you are drinking beet juice for its blood pressure effects, using a strong antibacterial mouthwash right before or after may be working against you. Standard fluoride toothpaste does not appear to have the same issue, since it does not target bacteria in the same broad-spectrum way chlorhexidine does.

This finding also has implications beyond beet juice. Some researchers have raised concern that habitual use of antibacterial mouthwash could subtly raise resting blood pressure by chronically suppressing the nitrate-reducing bacteria we depend on for baseline nitric oxide recycling. That hypothesis has not been settled with large-scale trials, but the mechanistic evidence is hard to ignore.

Beet Juice and Exercise Together

Blood pressure naturally drops after a bout of aerobic exercise, a phenomenon called post-exercise hypotension. Several research groups have asked whether combining beet juice with exercise amplifies that effect, and the answer appears to be yes in certain populations.

In a crossover trial of obese men, drinking beetroot juice before moderate-intensity aerobic exercise lowered ambulatory systolic blood pressure by about 5 mmHg in the six hours following the session, compared to exercise alone.¹³ A separate trial in postmenopausal women with hypertension found that beet juice before exercise produced a systolic drop of about 9 mmHg during recovery, compared to placebo.¹⁴ Both of these were relatively small studies, so the precise numbers should be held loosely, but the direction is consistent: beet juice and exercise appear to have additive effects on blood pressure lowering, at least in the hours immediately afterward.

For someone already exercising to manage their blood pressure, timing a glass of beet juice about two hours before a workout aligns peak nitrite levels with the exercise session and its recovery window.

Vascular Effects Beyond Blood Pressure

Blood pressure is the headline number, but beet juice also appears to improve the health and flexibility of blood vessels themselves. A systematic review and meta-regression of randomized controlled trials found that beetroot nitrate supplementation significantly reduced arterial stiffness (measured by pulse wave velocity) and improved endothelial function, meaning the lining of blood vessels became better at dilating on demand.¹⁵ These vascular improvements are meaningful because stiff arteries and poor endothelial function are independent risk factors for heart attacks and strokes, separate from whatever the blood pressure number says on a cuff.

One small but interesting study found that even a single dose of beetroot juice improved endothelial function in people living with HIV, a population that tends to have accelerated vascular aging.¹⁶ The vascular benefits of dietary nitrate may be broader than blood pressure alone, touching on the underlying health of the cardiovascular system.

Where the Evidence Weakens

Beet juice is not equally effective for everyone, and the most notable gap in the evidence involves people with type 2 diabetes. A two-week trial giving diabetic patients beetroot juice containing a substantial daily dose of nitrate found that while plasma nitrite and nitrate concentrations rose as expected, blood pressure did not budge.¹⁷ Neither endothelial function nor insulin sensitivity improved either. A separate trial in type 2 diabetics that measured concentrated beetroot juice against baseline found a modest within-group diastolic drop, but once the researchers adjusted for baseline values, the effect disappeared across all blood pressure, glucose, and lipid measures.¹⁸

Why the resistance? People with type 2 diabetes often have higher levels of oxidative stress and impaired endothelial function, which may interfere with the final conversion of nitrite to nitric oxide. The upstream part of the pathway (getting nitrate into the blood, converting it to nitrite in the mouth) works fine, but the downstream step where nitric oxide actually relaxes vessels seems to be blunted. This does not mean beet juice is useless for someone with diabetes, but the current evidence suggests you should not expect the same blood pressure benefit that healthier populations tend to see.

Kidney Disease and a Promising Early Signal

In contrast to the diabetes data, a pilot study in patients with chronic kidney disease found encouraging results. A single dose of beetroot juice reduced mean arterial pressure by about 8 mmHg and also lowered the renal resistive index, a measure of how much resistance blood faces flowing through the kidneys.¹⁹ Lowering renal resistance could theoretically slow the progression of kidney damage, since chronically high resistance contributes to kidney deterioration. This is a small pilot study, not a definitive finding, and anyone with kidney disease should discuss nitrate intake with their doctor. But the fact that the kidneys themselves showed a measurable hemodynamic response is a signal worth tracking.

Not All Beet Juice Products Are Created Equal

If you walk into a store or browse online for beetroot juice, you will find concentrated shots, bulk juices, powders, and mixed drinks. These products vary wildly in their actual nitrate content. A study that tested commercial beetroot products marketed to athletes found an almost 50-fold range in nitrate content across different products, and even samples of the same product from different batches varied by an average of 30%.²⁰ Concentrated shots had substantially more nitrate per milliliter than bulk juices or mixed drinks, and powders were the most concentrated by weight, though all categories showed batch-to-batch inconsistency.

This variability matters because the blood pressure trials that showed positive results used standardized doses, typically somewhere around 250 to 500 mL of juice calibrated to deliver a known quantity of nitrate. A generic bottle of beet juice from the grocery store may deliver a fraction of that dose, or an unpredictable amount that changes each time you buy it. If you are serious about using beet juice for blood pressure, concentrated products from brands that list nitrate content on the label give you the best chance of getting a consistent dose. Products that do not disclose nitrate concentration are essentially a gamble.

Do You Need Beet Juice Specifically?

Beets get the most attention, partly because they have a high nitrate density that makes them convenient for research, and partly because “beet juice lowers blood pressure” is a clean headline. But the active ingredient is inorganic nitrate, and plenty of other vegetables contain large amounts of it. Leafy greens such as arugula, spinach, and lettuce are especially rich sources.

A trial comparing beetroot juice against whole nitrate-rich vegetables (things like spinach, arugula, and bok choy) found that both approaches raised plasma nitrate and nitrite and lowered blood pressure by similar amounts after meals. Beetroot juice did produce somewhat higher peak plasma nitrate levels, but the blood pressure effect was statistically indistinguishable between the two groups.²¹ A separate crossover study comparing beetroot juice to a green leafy vegetable juice found that both raised nitrate and nitrite concentrations, with no significant difference in blood pressure reduction between the two.²²

The upshot: beet juice is a convenient and well-studied delivery vehicle for dietary nitrate, but if you prefer to eat a large salad heavy on arugula and spinach, you can get a comparable effect. The advantage of beet juice is dosing convenience and palatability (for those who like it). The advantage of whole vegetables is that you get fiber, a wider nutrient profile, and the satisfaction of actual food.

Beet Juice at High Altitude

An unexpected research thread has explored whether dietary nitrate supplementation helps people cope with the cardiovascular stress of high altitude. When you travel to elevation, blood oxygen drops and blood vessels in the lungs constrict, which strains the cardiovascular system. Endothelial function tends to deteriorate at altitude, and this vascular impairment can contribute to altitude sickness and reduced exercise capacity.

A review of the available evidence found potential improvements in endothelial function at altitude following nitrate supplementation.²³ A randomized crossover trial specifically tested this and found that a single dose of dietary nitrate completely abolished the reduction in endothelial function that healthy lowlanders experienced at high altitude.²⁴ The blood pressure implications at altitude have not been worked out as thoroughly as the sea-level data, but for hikers, climbers, and travelers heading to elevation, beet juice is starting to look like a reasonable and low-risk intervention for vascular health in thin air.

Side Effects and Practical Considerations

Beet juice is generally safe at the doses used in research. The most common side effect is beeturia, the harmless but startling reddish-pink tint that beets can give your urine and stool. It affects a variable percentage of the population, is entirely benign, and goes away on its own once you stop consuming beets.

More relevant is the interaction with blood pressure medications. If you are already on antihypertensives, adding a concentrated beet juice supplement that drops your systolic pressure by another 5 to 8 mmHg could push you into hypotension territory, especially if you are older or prone to dizziness when standing. This is the kind of thing worth mentioning to your doctor, particularly if your blood pressure is already well controlled on medication.

People on blood-thinning medications should also be aware that dietary nitrate can inhibit platelet aggregation, an effect documented alongside the blood pressure data in some of the same trials.²⁵ This is probably mild at food-level doses, but the interaction exists and stacks on top of whatever antiplatelet or anticoagulant therapy someone is already taking.

There is also the sugar content to consider. Beets are naturally high in sugar, and concentrated beet juices pack a fair amount of it into a small serving. For someone managing diabetes or watching carbohydrate intake, this is worth factoring in, especially given the evidence that beet juice may not lower blood pressure in diabetics anyway. A large arugula salad delivers the nitrate without the sugar load.

Finally, the oxalate content of beets is moderately high. For people with a history of calcium oxalate kidney stones, regularly consuming concentrated beet juice could be a concern, though casual amounts are unlikely to be an issue for most people. As with most dietary interventions, the dose and the individual both matter.