Beetroot supplements are primarily used to lower blood pressure, boost exercise performance, and support cardiovascular health. The active ingredient behind most of these benefits is dietary nitrate, a compound found in high concentrations in beets that your body converts into nitric oxide, a molecule that relaxes and widens blood vessels. This improved blood flow is the thread connecting nearly every benefit linked to beetroot.
How Beetroot Works in Your Body
When you take a beetroot supplement, the nitrates it contains follow a specific conversion path. Bacteria in your mouth and digestive tract first convert the nitrates into nitrites. From there, various biochemical pathways turn those nitrites into nitric oxide, a signaling molecule involved in blood vessel dilation, immune function, and neurotransmission.
Nitric oxide relaxes and widens both arteries and veins, which enhances blood circulation and oxygen delivery to tissues throughout your body. This single mechanism explains why beetroot shows up in research on blood pressure, athletic endurance, and metabolic health. It also explains why antiseptic mouthwash can blunt beetroot’s effects: killing oral bacteria disrupts the very first step of nitrate conversion.
Blood Pressure Reduction
The best-studied benefit of beetroot supplements is their effect on blood pressure. On average, daily nitrate intake from beetroot lowers systolic blood pressure (the top number) by about 4 to 5 mmHg and diastolic pressure (the bottom number) by roughly 2 mmHg. That may sound modest, but a sustained drop of 4 to 5 points in systolic pressure is clinically meaningful and comparable to the effect of some first-line blood pressure medications.
The effective dosage for blood pressure benefits ranges from about 200 to 800 mg of nitrate per day, which translates to roughly 70 to 250 mL of beetroot juice. In capsule or powder form, higher nitrate doses (744 to 1,488 mg) have been studied. The key variable is the actual nitrate content of whatever product you choose, which varies enormously between brands and formats.
Exercise Performance and Endurance
Beetroot is one of the few legal supplements with solid evidence for improving athletic performance. The nitric oxide boost reduces how much oxygen your muscles need during submaximal exercise by about 4%, meaning you can sustain the same effort while burning less energy. In time-to-exhaustion tests, moderate doses of nitrate (around 8.4 mmol, or roughly 520 mg) increased endurance by 14%. Interestingly, doubling to a high dose didn’t improve results further, with the high-dose group seeing a 12% increase.
Low doses taken as a single pre-workout hit don’t appear to help much. The research suggests a threshold effect: you need a moderate amount of nitrate to see performance gains, but more isn’t necessarily better. For exercise, the effective range is about 250 to 1,000 mg of nitrate from beetroot juice, taken 2 to 3 hours before your workout. That timing matters because plasma nitrite levels, the form most directly linked to nitric oxide production, peak about 2 to 3 hours after ingestion.
Most of the performance data comes from endurance-type activities like running, cycling, and rowing. There’s also evidence for explosive, anaerobic performance (think sprints or high-intensity intervals), where dosages of 370 to 1,000 mg of nitrate have been effective. Elite athletes tend to see smaller benefits than recreational exercisers, likely because their cardiovascular systems are already highly optimized.
Blood Sugar After Meals
A newer area of interest is beetroot’s effect on blood sugar. In a randomized crossover trial of 18 healthy adults, drinking beetroot juice containing 600 mg of nitrate alongside a carbohydrate-heavy meal significantly blunted the post-meal blood sugar spike. The glucose peak was about 20% lower compared to placebo (2.67 mmol/L versus 3.33 mmol/L above baseline), and the total glucose exposure over the first hour dropped by roughly 22%.
This is early-stage evidence from a small study in healthy people, not a treatment for diabetes. But the finding suggests that beetroot’s vascular effects may help glucose reach muscle tissue more efficiently after eating, reducing the sharp blood sugar spikes that, over time, can damage blood vessels and contribute to insulin resistance.
What About Brain Health?
Because nitric oxide improves blood flow, researchers have tested whether beetroot might boost cerebral circulation and cognitive function, particularly in older adults. The logic is reasonable: more blood flow to the brain could mean better oxygen delivery and sharper thinking. However, a 13-week randomized trial in adults aged 60 to 75 found no significant improvements in cognitive function or cerebral blood flow at any dose tested, from one concentrated shot every other day up to two shots daily. Neither memory tasks, mental arithmetic, nor attention tests showed meaningful changes compared to placebo.
This doesn’t rule out brain benefits entirely, as other populations or longer timeframes might yield different results. But based on available evidence, cognitive enhancement is not a reliable reason to take beetroot supplements.
Juice, Powder, or Capsules
The form you choose matters more than you might expect, because nitrate content varies wildly across products. Concentrated beetroot juice delivers the most nitrate per serving, up to 2,850 mg in an 8-ounce glass. Fresh beetroot juice provides around 700 mg per 8 ounces, while non-concentrated packaged juice drops to about 550 mg. Beetroot powder delivers up to 320 mg per tablespoon, and there can be as much as a 50-fold difference in nitrate levels between powder brands.
Concentrated beetroot juice shots (typically 70 mL) are the format used in most research and offer the most reliable and standardized nitrate content. If you prefer powder or capsules for convenience, look for products that list the nitrate content on the label in milligrams. Without that number, you’re guessing. A powder that doesn’t disclose its nitrate content could contain a trivially small amount.
Practical Dosing Guidelines
The effective dosage depends on what you’re after:
- Blood pressure: 200 to 800 mg of nitrate daily from beetroot juice, or 744 to 1,488 mg from capsules. Consistency matters here, as the blood pressure effects require daily intake.
- Endurance exercise: 250 to 1,000 mg of nitrate, taken 2 to 3 hours before training or competition.
- Explosive/anaerobic exercise: 370 to 1,000 mg of nitrate per day, also timed 2 to 3 hours pre-workout.
- Vascular function: 200 to 1,000 mg of nitrate from 70 to 250 mL of beetroot juice.
Peak nitrate levels in your blood arrive about 1 hour after drinking beetroot juice, but peak nitrite (the more active form) takes 2 to 3 hours. That 2 to 3 hour window before exercise is not arbitrary. If you take it too close to your workout, the conversion process won’t have finished.
Side Effects and Limitations
Beetroot supplements are generally well tolerated. The most common and harmless side effect is beeturia, a reddish discoloration of urine and sometimes stool that can be alarming if you’re not expecting it. It’s not a sign of anything wrong.
People taking nitrate-based medications for chest pain or blood pressure should be cautious, since stacking dietary nitrate on top of pharmaceutical nitrate can cause an unsafe drop in blood pressure. Beetroot is also relatively high in oxalates, which may be a concern if you’re prone to kidney stones. And because the nitrate-to-nitric-oxide pathway depends on oral bacteria, regular use of antibacterial mouthwash can reduce beetroot’s effectiveness.