Beetroot delivers a concentrated dose of dietary nitrates that your body converts into nitric oxide, a molecule that relaxes and widens blood vessels. For men specifically, this translates into measurable benefits for blood pressure, exercise performance, blood flow (including to the penis), and brain function. Most of these effects kick in within one to three hours after consumption and last up to 24 hours.
How Beetroot Works in Your Body
When you eat beetroot or drink its juice, bacteria on the back of your tongue convert the nitrates into nitrite, which then circulates through your bloodstream and gets further converted into nitric oxide. This compound signals the smooth muscle lining your blood vessels to relax, allowing more blood to flow with less resistance. That single mechanism drives most of the benefits men search for: lower blood pressure, better workouts, and improved circulation everywhere, including below the belt.
Plasma nitrate levels peak between one and three hours after a single dose. Concentrated powders that contain nitrite directly can peak in as little as 30 minutes, since they partially bypass the slower conversion step in your saliva.
Blood Pressure Reduction
High blood pressure is more common in men than in premenopausal women, which makes this one of beetroot’s most relevant effects. In a placebo-controlled trial, men who drank beetroot juice saw systolic blood pressure drop by 4 to 5 mmHg within six hours. Other studies have found even larger effects: one randomized crossover trial measured a drop of roughly 20 mmHg systolic and 15 mmHg diastolic two to three hours after ingestion, compared to a water control. That reduction is comparable to what some blood pressure medications achieve.
The effect appears to be dose-dependent up to a point. Doubling the nitrate content of the juice produced a slightly larger drop, but the relationship levels off at higher amounts. A single serving of about 250 to 500 mL of juice (or one concentrated shot) is enough to produce a noticeable reduction that can persist in systolic pressure for up to 24 hours.
Exercise Performance and Endurance
Beetroot has become one of the most studied legal performance supplements in sports nutrition. The core finding is straightforward: nitrate supplementation reduces the oxygen cost of submaximal exercise. In practical terms, your muscles need less oxygen to produce the same amount of work, so you can sustain effort longer before fatigue sets in. Studies have confirmed improvements in both muscle contractile efficiency and overall exercise tolerance.
The Australian Institute of Sport classifies beetroot juice as a Group A supplement, meaning it has strong evidence supporting its use. Their recommended protocol is 350 to 500 mg of nitrate (roughly 6 to 8 mmol) consumed two to three hours before exercise. That’s about one 70 mL concentrated shot of a product like Beet It Sport. Taking more than about 10 to 12 mmol provides no additional benefit over the 6 to 8 mmol dose, so more is not better here.
For men who train regularly, some evidence supports a multi-day loading approach in addition to the acute pre-workout dose, though a single serving still produces measurable effects on its own.
Blood Flow and Erectile Function
Erections depend almost entirely on nitric oxide. Nerve and endothelial cells in the penis release nitric oxide, which triggers a chain reaction: smooth muscle in the erectile tissue relaxes, blood vessels dilate, and blood flow to the penis increases several-fold, expanding the spongy tissue that produces rigidity. Any disruption to nitric oxide production or signaling can impair this process.
This is the same pathway that prescription erectile dysfunction medications target. Those drugs don’t create nitric oxide directly; they prevent the breakdown of a downstream signaling molecule, extending the effect of whatever nitric oxide is already present. Beetroot works upstream by supplying raw material (nitrate) that your body converts into additional nitric oxide. The two approaches are complementary in theory, though the direct evidence for beetroot juice improving erections specifically is still limited compared to the robust data on blood pressure and exercise.
What is well established is that dietary nitrates improve vascular function broadly, and erectile quality is fundamentally a vascular issue. Men with early blood pressure problems or reduced blood flow are the most likely to notice a difference.
Brain Blood Flow
Beetroot juice has been shown to increase regional blood flow in the frontal lobe, the area of the brain responsible for decision-making, attention, and working memory. This effect has been demonstrated in older adults after just 24 hours of a high-nitrate diet supplemented with beetroot juice. During cognitive tasks, beetroot modulates blood flow to the prefrontal cortex with some corresponding improvement in task performance.
For men concerned about age-related cognitive decline, this is a notable finding. The frontal lobe is one of the first brain regions to show reduced blood flow with aging, and it governs exactly the kinds of thinking, like planning and focus, that people notice slipping first.
Trace Minerals and Testosterone
Beetroot contains small amounts of boron, a trace mineral that has shown intriguing effects on male hormones. In a small study of healthy men, supplementing with 6 mg of boron daily for just one week raised free testosterone from an average of 11.83 pg/mL to 15.18 pg/mL, a roughly 28% increase. However, the amount of boron in a typical serving of beetroot is far lower than 6 mg, so you would not replicate that study’s results from beetroot alone. It’s better understood as one small contributor within a broader diet rather than a meaningful testosterone intervention on its own.
Choosing a Beetroot Product
Not all beetroot products contain enough nitrate to do anything useful. Lab testing of products marketed to athletes found enormous variation. Concentrated powders had the highest nitrate content per gram, followed by liquid concentrates, then bulk juices and mixed drinks at the bottom. Some mixed drinks contained so little nitrate they were unlikely to produce any physiological effect.
If performance or blood pressure is your goal, look for a product that guarantees at least 5 to 6 mmol (roughly 300 to 400 mg) of nitrate per serving. Concentrated shots and powders from brands that list nitrate content on the label are the most reliable options. Bulk juice from grocery stores is fine nutritionally but often delivers a fraction of what the concentrated versions provide.
One practical note on powders: some products contain nitrite in addition to nitrate, which means plasma levels can peak within 30 minutes rather than the typical two to three hours. That faster onset can be useful if you’re taking it right before a workout rather than planning ahead.
Oxalates and Kidney Stone Risk
Beets contain about 61 mg of oxalate per 100 g serving. Oxalates bind with calcium in the kidneys and can contribute to calcium oxalate stones, the most common type of kidney stone in men. If you have a history of these stones, concentrated daily beetroot intake is worth discussing with your doctor. Dietary restriction of high-oxalate foods remains a standard recommendation for recurrent stone formers.
For men without kidney stone history, the oxalate content in beetroot is not a concern at normal intake levels. Staying well hydrated and consuming adequate calcium with meals (which binds oxalate in the gut before it reaches the kidneys) are the standard protective strategies. One other harmless but startling side effect: beetroot can turn your urine and stool red or pink. It’s called beeturia and it’s completely benign.