There is no clinically established dose of beet juice specifically proven to treat erectile dysfunction. The research connecting beet juice to erections is still in its early stages, with only one published clinical study directly measuring the effect on penile rigidity, and that study used beet root combined with L-citrulline rather than juice alone. What the broader cardiovascular and sports-performance literature suggests, though, is that roughly 300 to 400 milligrams of dietary nitrate from beetroot, equivalent to about 250 to 500 milliliters of regular juice or a single 70-milliliter concentrated shot, raises nitric oxide levels enough to measurably improve blood-vessel function. Whether that translates into harder or more reliable erections depends on the cause of the problem, and the science here is more interesting than the supplement marketing lets on.
Why Beet Juice Enters the Conversation at All
Erections depend on nitric oxide. When sexual arousal sends nerve signals to the penis, the smooth muscle lining the blood vessels of the erectile tissue relaxes, allowing blood to rush in and create rigidity. That relaxation is driven by nitric oxide triggering a cascade that produces a molecule called cyclic GMP, which is what actually loosens the muscle fibers. Block nitric oxide production and the relaxation essentially stops, as early laboratory work on penile tissue demonstrated decades ago.1PubMed. Nitric oxide and cyclic GMP formation upon electrical field stimulation cause relaxation of corpus cavernosum smooth muscle 2PubMed. Nitric oxide as a mediator of relaxation of the corpus cavernosum in response to nonadrenergic, noncholinergic neurotransmission This is the same pathway that drugs like sildenafil (Viagra) exploit: they do not create nitric oxide but instead prevent cyclic GMP from being broken down, amplifying whatever signal is already there.
Beet juice is rich in inorganic nitrate. When you drink it, bacteria on your tongue convert nitrate into nitrite, which then gets further converted into nitric oxide throughout the body.3The Journal of Nutrition. Inorganic Nitrate Supplementation as Red Beetroot Juice Alters the Oral Microbiome and Salivary and Plasma Nitric Oxide Metabolites in Middle-Aged and Older Adults with Overweight and Obesity The logic is straightforward: if erections need nitric oxide, and beet juice boosts nitric oxide, maybe beet juice helps erections. The logic is reasonable, but the chain from drinking juice to getting better erections has mostly been tested only at its endpoints, not across the full sequence in the same study.
What the Only Direct Study Actually Found
A study presented at the Sexual Medicine Society of North America measured nighttime erections in men taking a supplement that combined L-citrulline with beetroot. Nighttime erections are a useful research tool because they happen automatically during REM sleep, removing psychological variables from the equation. The men who took the supplement showed a meaningful increase in the area under the curve of penile rigidity per hour of sleep compared to when they took nothing, with a mean difference that was statistically significant. The number of erections per night did not change, though, suggesting the supplement affected the quality of each erection rather than how often they occurred.4The Journal of Sexual Medicine. L-CITRULLINE AND BEET ROOT SUPPLEMENT IMPROVES NIGHTTIME ERECTIONS
The catch is that this was a combination product. L-citrulline is an amino acid that the body converts into L-arginine, which is itself a precursor to nitric oxide through a completely different pathway than the nitrate-nitrite route beet juice uses. So while the result is encouraging, you cannot cleanly attribute it to the beetroot component alone. A separate trial looking at beetroot powder with or without added L-arginine found that the beet-containing meals showed a non-significant trend toward better blood-vessel dilation, while the presence or amount of L-arginine made no measurable difference.5PubMed Central. Effects of Beetroot Powder with or without L-Arginine on Postprandial Vascular Endothelial Function That hints the beet component might be doing more of the heavy lifting, but “non-significant trend” is scientist-speak for “we can’t be sure.”
Borrowing Doses From Cardiovascular Research
Since there is no ED-specific dose, anyone experimenting with beet juice is extrapolating from studies on blood pressure, exercise performance, and vascular function. A dose-response study in healthy adults found that plasma nitrite rose in proportion to the amount of beetroot juice consumed, with peak levels appearing about two to three hours after drinking.6PubMed. Beetroot juice and exercise: pharmacodynamic and dose-response relationships Most positive cardiovascular trials use doses delivering somewhere around 5 to 8 millimoles of nitrate, which loosely translates to 250 to 500 milliliters of regular beet juice or a single concentrated shot of 70 milliliters from brands that standardize their nitrate content.
A trial in healthy men found that even a lower dose, about 1.1 millimoles of nitrate delivered through 100 grams of beetroot baked into bread, was enough to improve a measure of blood-vessel relaxation and lower diastolic blood pressure for up to six hours.7The Journal of Nutrition. Acute Ingestion of Beetroot Bread Increases Endothelium-Independent Vasodilation and Lowers Diastolic Blood Pressure in Healthy Men That is a surprisingly small amount of beet. The vascular effects may not require as much nitrate as the exercise-performance literature uses, which matters because the blood-vessel relaxation pathway is the one relevant to erections.
In a 12-week supplementation trial, participants drinking beetroot juice containing about 380 milligrams of nitrate daily saw their fasting plasma nitrate and nitrite levels rise compared to baseline, and the acute spike after each dose remained robust throughout the study period.8Taylor & Francis Online / PubMed Central. Efficacy and Variability in Plasma Nitrite Levels during Long-Term Supplementation with Nitrate Containing Beetroot Juice That is reassuring because it means the body does not seem to stop responding to the nitrate over weeks of daily use, the way it does with some supplements.
Timing Your Dose
If the goal is to have elevated nitric oxide levels during a particular window, timing matters. Plasma nitrite, the immediate precursor to nitric oxide, peaks roughly two to three hours after you drink beetroot juice.6PubMed. Beetroot juice and exercise: pharmacodynamic and dose-response relationships A study in older adults with heart failure noted that blood drawn one hour after juice consumption may have missed the true peak, which recent evidence in healthy older adults places at the two-to-three-hour mark.9PubMed Central. One Week of Daily Dosing with Beetroot Juice Improves Submaximal Endurance and Blood Pressure in Older Patients with Heart Failure and Preserved Ejection Fraction So drinking beet juice two to three hours before you want the effect is a reasonable strategy. The effects taper off over six or so hours, but the strongest window is that two-to-three-hour peak.
Daily use rather than one-off dosing also has advantages. The 12-week trial mentioned earlier showed that fasting nitrite and nitrate levels climbed over time, suggesting that regular intake builds a higher baseline on top of which each acute dose adds its spike.8Taylor & Francis Online / PubMed Central. Efficacy and Variability in Plasma Nitrite Levels during Long-Term Supplementation with Nitrate Containing Beetroot Juice If your interest is in general vascular health rather than a one-night effect, consistent daily intake is the more promising approach.
The Mouthwash Problem
Here is something almost nobody mentions in supplement marketing: antiseptic mouthwash can cancel out a large portion of the benefit. The nitrate-to-nitrite conversion that makes beet juice work happens on your tongue, performed by specific bacteria living there. Kill those bacteria with chlorhexidine-based mouthwash and the entire upstream part of the pathway shuts down. In one study, using chlorhexidine mouthwash before consuming nitrate completely blocked the rise in plasma nitrite that would normally follow.10PubMed Central. Increased Nitrate Intake From Beetroot Juice Over 4 Weeks Changes the Composition of the Oral, But Not the Intestinal Microbiome In another, people with treated high blood pressure who used antibacterial mouthwash for three days saw their systolic blood pressure rise because the pathway was disrupted.11PubMed Central. Dietary Nitrate Bioactivation at the Diet–Microbiota–Host Interface
If you are spending money on beet juice or concentrated beetroot supplements and simultaneously using antibacterial mouthwash daily, you are likely undermining the mechanism you are trying to harness. Standard fluoride toothpaste does not have this effect; it is specifically the antibacterial rinses that matter. This is one of the more actionable and underappreciated pieces of the puzzle.
Not All Beet Juice Is Created Equal
One of the biggest practical problems is that nitrate content varies wildly between products. An analysis of beet juice products marketed to athletes found almost a 50-fold range in nitrate content between different brands, and even samples of the same product varied by an average of about 30 percent from batch to batch, with some products showing as much as 83 percent variation.12PubMed Central. What Is in Your Beet Juice? Nitrate and Nitrite Content of Beet Juice Products Marketed to Athletes A separate analysis of commercial beetroot juices and powders found nitrate levels ranging from 0.01 to 2.4 grams per liter.13Journal of Food Composition and Analysis. Compositional characteristics of commercial beetroot products and beetroot juice prepared from seven beetroot varieties grown in Upper Austria
This means that “a glass of beet juice” is not a meaningful dose. Two glasses from different brands could deliver a tenfold difference in nitrate. Concentrated shots that standardize their nitrate content (some sports-nutrition brands list nitrate amount on the label) give you much more control. If you are juicing beets at home, the nitrate content depends on the variety, the soil, the growing conditions, and how long the beets sat in your fridge. You are essentially flying blind on dosage.
Saliva test strips exist that measure nitrite levels and could theoretically tell you whether your supplementation is working at the oral-conversion step. Validation studies show that the better strips correlate reasonably well with laboratory measures of salivary nitrite, though they do not track blood levels reliably.14PubMed Central. Validation of two Point-of-care Tests against Standard Lab Measures of NO in Saliva and in Serum They are a rough gauge, not a precise instrument, but they can at least confirm that your mouth bacteria are doing their job after you drink the juice.
Exercise Makes the Whole System Work Better
Beet juice and exercise appear to amplify each other. A trial in people with peripheral artery disease, a condition where reduced blood flow to the legs causes pain during walking, combined a 12-week supervised exercise program with daily beetroot juice. The group that got both exercise and beet juice improved their walking endurance by about three times as much as the group that got exercise plus a placebo. The beetroot-plus-exercise group also walked about 53 meters farther in a six-minute walk test, compared to about 25 meters more in the exercise-only group, and showed improved blood flow to the working muscles.15PubMed Central. Beet the Best?
This is relevant to erectile dysfunction because the vascular mechanisms overlap. The arteries supplying the penis are smaller than those supplying the legs, which is why ED often shows up years before more obvious cardiovascular problems. Anything that improves vascular function broadly, such as aerobic exercise combined with nitrate supplementation, is working on the same underlying issue. Exercise independently improves endothelial function and nitric oxide production through the body’s own enzymatic pathway, which is separate from the dietary nitrate route. Using both routes simultaneously is like opening two doors into the same room.
What Beet Juice Cannot Do
Erectile dysfunction has many causes, and only some of them are vascular. Psychological factors, hormonal imbalances, nerve damage from surgery or diabetes, medication side effects, and pelvic-floor dysfunction can all cause or worsen ED. Beet juice acts only on the nitric oxide side of the equation, which means it is most plausible as a help for men whose ED is primarily driven by poor blood-vessel function, typically associated with aging, metabolic syndrome, or early cardiovascular disease.
An animal study in aged mice found that beetroot juice supplementation improved the aorta’s ability to relax in response to acetylcholine, a response that was weakened by aging. The improvement was tied to enhanced nitric oxide availability and reduced oxidative stress.16PubMed Central. Effects of beetroot juice supplementation on vascular functional and structural changes in aged mice That is a mouse aorta, not a human penis, but the vascular biology is similar enough to be suggestive. The finding aligns with the broader principle that age-related declines in nitric oxide availability contribute to both general cardiovascular stiffening and ED.
Men whose ED stems primarily from anxiety, relationship issues, low testosterone, or neurological damage are unlikely to see meaningful improvement from beet juice, no matter the dose. And even for vascular ED, beet juice is generating a modest nudge to nitric oxide levels, not the powerful pharmacological boost that PDE5 inhibitors provide. Expecting it to work like Viagra is setting yourself up for disappointment.
The Vitamin C Connection
An interesting wrinkle involves what else is in your stomach when the nitrite arrives there. Vitamin C, which is present in many fruits and vegetables, helps convert nitrite to nitric oxide in the acidic environment of the stomach rather than allowing it to form potentially harmful compounds called N-nitroso compounds.17PubMed Central. Effect of Vitamin C and Protein Supplementation on Plasma Nitrate and Nitrite Response following Consumption of Beetroot Juice Beet juice naturally contains some vitamin C, and consuming it alongside other vitamin-C-rich foods may help steer the chemistry in a favorable direction. This is not something you need to overthink, but it does mean that taking beet juice as part of a meal or alongside fruit rather than on a completely empty stomach might have marginal advantages.
Practical Recommendations for Someone Who Wants to Try It
Given the state of the evidence, no doctor can write you a beet juice prescription for ED. But if you want to experiment, here is what the research suggests as a reasonable approach:
- Choose a standardized product: Concentrated beetroot shots that list their nitrate content on the label give you far more dosing control than bulk juice or home-juiced beets, where nitrate content is unpredictable.
- Aim for 300 to 500 mg of nitrate daily: This is the range used in most positive cardiovascular trials. Some concentrated shots deliver this in a single 70 mL serving.
- Drink it two to three hours before you want peak effect: That is when plasma nitrite levels are highest.
- Skip the antibacterial mouthwash: It can block the oral bacteria that convert nitrate to nitrite, undermining the mechanism you are trying to use.
- Combine with regular exercise: The evidence for synergy between physical activity and beetroot supplementation is stronger than the evidence for either alone in the context of vascular function.
- Do not treat it as a replacement for medical evaluation: ED that comes on gradually, especially in men over 40, can be an early warning sign of cardiovascular disease. A conversation with a doctor about the underlying cause is more important than any supplement choice.
Common Side Effects and Surprises
Beet juice will turn your urine and sometimes your stool a startling shade of red or pink. This is called beeturia and it is harmless, caused by betalain pigments passing through your system. It affects a significant minority of people and can cause real alarm if you are not expecting it. It has nothing to do with blood and does not indicate any problem.
Because beet juice lowers blood pressure, men already taking antihypertensive medications should be cautious. The blood-pressure drop from a single dose is usually modest, on the order of a few mmHg for diastolic pressure, but stacking it on top of prescription blood-pressure medication could occasionally cause lightheadedness, especially when standing up quickly. If you take nitrate medications for angina (like nitroglycerin), the same caution that applies to PDE5 inhibitors applies here in principle: adding more nitric oxide to a system already flooded with it can drop blood pressure dangerously. This interaction is less dramatic with dietary nitrate than with pharmaceutical nitrates, but it is worth flagging with your prescriber.
Kidney stones are another occasional concern. Beets are high in oxalates, which can contribute to calcium-oxalate kidney stones in susceptible individuals. If you have a history of kidney stones, concentrated daily beet consumption is worth discussing with your doctor before starting. People without that history generally have nothing to worry about at the doses discussed here.