Beet juice is best known for lowering blood pressure, but it also improves exercise performance, supports brain health in older adults, and delivers a concentrated dose of antioxidants. Most of these benefits trace back to a single compound: dietary nitrate, which beets contain in unusually high amounts. Here’s what the evidence actually shows and how to get the most from it.
How Beet Juice Works in Your Body
The key ingredient in beet juice is dietary nitrate, a naturally occurring compound found in root vegetables and leafy greens. Beets happen to be one of the richest sources. When you drink beet juice, the nitrate enters your bloodstream and concentrates in your saliva. Bacteria living on your tongue then convert that nitrate into a related compound called nitrite. This step is essential because human cells can’t make the conversion on their own.
Once you swallow that nitrite-rich saliva, your body further converts it into nitric oxide, a molecule that relaxes and widens blood vessels. This is the mechanism behind nearly every benefit beet juice offers: wider blood vessels mean lower blood pressure, more efficient oxygen delivery to muscles, and better blood flow to the brain. It’s also why using antibacterial mouthwash can actually blunt the effects of beet juice, since it kills the oral bacteria you need for that first conversion step.
Blood Pressure Reduction
The strongest evidence for beet juice involves blood pressure. A meta-analysis of 16 clinical trials found that beetroot juice supplementation reduced systolic blood pressure (the top number) by an average of 4.4 mmHg. In older, overweight adults specifically, a three-week course of beetroot juice concentrate lowered daily systolic pressure by 7.3 mmHg. A 2024 review of studies found reductions as high as 7.46 mmHg after 90 days of consuming 200 to 800 mg of nitrates from beetroot juice.
To put those numbers in context, a drop of 5 mmHg in systolic blood pressure is clinically meaningful. It’s in the range that physicians consider worth pursuing through lifestyle changes. For someone with mildly elevated blood pressure, beet juice could be a useful addition to a broader strategy that includes exercise and dietary adjustments.
One important caveat: the effect doesn’t persist after you stop drinking it. In the study of older adults, blood pressure crept back up within a week of stopping supplementation. Beet juice works while you’re consuming it regularly, not as a one-time fix.
Exercise and Athletic Performance
Beet juice has become popular among endurance athletes for good reason. By boosting nitric oxide levels, it helps muscles extract more oxygen from the blood during exercise. In moderate-intensity exercise, beet juice reduced the body’s oxygen demand by 19%, meaning muscles worked more efficiently with less effort. During high-intensity exercise, time to exhaustion improved by 16%.
Competitive cyclists who consumed beet juice about 2.5 to 3 hours before time trials saw performance gains of roughly 2.7% to 2.8%. That may sound small, but in competitive endurance sports, a 2 to 3% improvement is the difference between finishing in the pack and standing on the podium.
Timing matters. Most studies showing performance benefits had participants drink beet juice 2.5 to 3 hours before exercise, which allows enough time for the nitrate-to-nitric-oxide conversion to peak. Drinking it right before a workout likely won’t produce the same effect.
Brain Health in Older Adults
Research from Wake Forest University found that combining beet juice with exercise improved blood flow to areas of the brain involved in movement and body awareness. Specifically, the functional connections between the motor cortex (which processes signals from your muscles) and deeper brain regions that support mobility looked more like those of younger adults.
The logic is straightforward: exercise naturally strengthens the brain’s movement-processing areas, and beet juice delivers extra oxygen to those same regions by dilating blood vessels. Together, they create a better environment for maintaining the neural networks that keep older adults steady on their feet. This line of research is still relatively early, but the combination of beet juice plus regular physical activity appears particularly promising for preserving mobility as you age.
Juice, Concentrate, or Powder?
Not all beet products deliver the same amount of nitrate, and that matters because the dose drives the benefits. Here’s how they compare per serving:
- Concentrated beetroot juice: up to 2,850 mg of nitrate per 8-ounce serving
- Fresh beetroot juice: around 700 mg per 8-ounce serving
- Non-concentrated packaged juice: around 550 mg per 8-ounce serving
- Beetroot powder: up to 320 mg per tablespoon
Juice also delivers significantly more polyphenols (plant-based antioxidants) than powder. Fresh juice contains up to 265 mg per serving compared to about 40 mg in a tablespoon of powder. These polyphenols contribute to the blood pressure benefits independently of nitrate.
Beet powder is convenient, but quality varies wildly. Studies have found as much as a 50-fold difference in nitrate content between powder products. If you go the powder route, there’s no guarantee you’re getting a meaningful dose unless the brand provides third-party testing for nitrate content. For reliable results, concentrated beetroot juice (often sold in small “shots”) is the best-studied and most consistent option.
Side Effects and Who Should Be Cautious
The most common side effect is also the most alarming if you’re not expecting it. About 10% to 14% of people experience beeturia, a harmless condition where urine or stool turns red or pink after eating beets. It happens because of a pigment called betanin that some people can’t fully break down. It looks startling but is completely benign.
The more serious concern involves oxalates. Beetroot juice contains 60 to 70 mg of oxalate per 100 ml, which is high among fruit and vegetable juices (second only to rhubarb nectar). If you’re drinking 500 ml or more per day, that adds a substantial amount of oxalate to your diet. For people with a history of calcium oxalate kidney stones, this is worth paying attention to. Even smaller daily servings add up over time, so anyone prone to kidney stones should factor beet juice into their total oxalate intake rather than treating it as a free addition.
Beet juice can also lower blood pressure enough to cause lightheadedness in people who already run on the low side or who take blood pressure medication. If that applies to you, starting with a smaller serving and monitoring how you feel is a reasonable approach.