Beetroot pills are primarily used to support healthy blood pressure, boost exercise performance, and deliver antioxidant compounds linked to heart and brain health. The active ingredient driving most of these benefits is dietary nitrate, which your body converts into nitric oxide, a molecule that relaxes and widens blood vessels. Most beetroot supplements come as concentrated powder capsules or tablets, packing the key compounds from beets into a convenient daily dose.
How Beetroot Pills Work in Your Body
The nitrate in beetroot pills follows a specific path once you swallow them. Your gut absorbs the nitrate, then your body circulates some of it back to your mouth, where bacteria on your tongue convert it into a more active form called nitrite. When you swallow that nitrite, the acid in your stomach converts it into nitric oxide. This nitric oxide enters your bloodstream and causes blood vessel walls to relax and widen, which is the mechanism behind the blood pressure and circulation benefits.
This process explains why mouthwash can actually reduce the effectiveness of beetroot supplements. Antibacterial mouthwash kills the tongue bacteria responsible for that critical first conversion step.
Blood Pressure Reduction
Lowering blood pressure is the most well-studied benefit of beetroot supplementation. A meta-analysis of seven randomized controlled trials involving 218 people with high blood pressure found that beetroot-derived nitrate lowered systolic blood pressure (the top number) by about 5 mmHg on average. In studies using clinic measurements specifically, the reduction was closer to 7.7 mmHg. The effect on diastolic pressure (the bottom number) was smaller and not statistically significant, averaging less than 1 mmHg.
A 5 to 8 point drop in systolic pressure is meaningful. For context, that’s in the same range as some first-line blood pressure medications, though beetroot pills are not a replacement for prescribed treatment. The effect comes from nitric oxide relaxing blood vessel walls, reducing the resistance your heart has to pump against.
Exercise and Endurance Performance
Athletes and recreational exercisers use beetroot pills to squeeze out extra performance, and the research supports this in certain contexts. Trained cyclists who supplemented with beetroot juice improved their 16.1 km time trial performance by 2.7% and their 4 km time trial by 2.8%. Their efficiency, measured as power output relative to oxygen use, improved by 7% and 11% in those same trials. In one study, time to exhaustion at high intensity improved by 16% in trained cyclists.
Runners saw a slightly different pattern. A 5,000-meter test showed no significant overall improvement, but runners were 5% faster in the final stretch of the race, suggesting beetroot may help most when fatigue is setting in. The benefits appear strongest during sustained, high-intensity efforts rather than short bursts of power.
Brain Health and Blood Flow
Because nitric oxide widens blood vessels throughout the body, beetroot supplementation can also increase blood flow to the brain. Research has shown that a high-nitrate dose from beetroot increased blood flow specifically in the white matter of the frontal brain, along pathways connecting areas responsible for executive function: planning, decision-making, and attention. These are the same brain networks that tend to decline early in age-related cognitive conditions like Alzheimer’s disease.
The cognitive benefits are still being explored, and results so far are mixed. But the underlying vascular mechanism is well established. Better blood flow means more oxygen and nutrient delivery to brain tissue, which is particularly relevant for older adults whose cerebral circulation naturally declines with age.
Antioxidant and Cellular Protection
Beyond nitrates, beetroot contains a class of pigments called betalains, the compounds responsible for that deep red-purple color. Betalains act as antioxidants by neutralizing free radicals, preventing DNA damage, and reducing oxidation of LDL cholesterol (the type linked to artery plaque buildup). They also help regulate fat metabolism, which may benefit people with high cholesterol.
Lab studies have shown that betanin, the most abundant betalain in beetroot, both directly scavenges free radicals and triggers your cells’ own antioxidant defense systems. Early research also suggests betalains have anti-tumor properties, inhibiting the growth and blood supply of cancer cells in laboratory settings. These findings are preliminary and come from cell studies, not clinical trials in humans, but they point to beetroot’s value beyond just nitrate content.
Timing and Dosage
Nitrate levels in your blood peak about 1 to 2 hours after taking a beetroot supplement, while nitrite (the more active form) peaks at around 3 hours and stays elevated throughout the day. If you’re taking beetroot pills for exercise, consuming them 2 to 3 hours before your workout aligns with peak availability. For general health benefits like blood pressure support, timing matters less since a single daily dose maintains elevated levels all day.
Clinical trials have used a wide range of doses. One 12-week safety study in older adults used 20 grams of standardized beetroot extract daily (split into two 10-gram doses), providing approximately 548 mg of nitrate per day. This was well tolerated with no safety concerns. Most commercial beetroot pills contain far less than this, so checking the nitrate content on the label is important. Look for products that list actual nitrate content in milligrams rather than just total beetroot powder weight.
Pills vs. Juice vs. Whole Beets
All forms of beetroot deliver nitrates, but each has trade-offs. Juices and concentrated powders tend to have higher nitrate concentrations per serving, making dosing more predictable. Whole beets provide fiber, vitamins, and a broader nutritional profile that supplements can’t fully replicate. Pills offer convenience and avoid the strong earthy taste that many people dislike, but they typically lack the fiber found in whole beets.
If your primary goal is blood pressure or exercise support, pills and concentrated juice are the most practical ways to get a reliable nitrate dose. If you’re after overall nutrition, whole beets are the better choice. Many people combine both, eating beets as part of their diet and using pills around workouts or as a daily supplement.
Side Effects and Who Should Be Cautious
The most common and most visible side effect is beeturia, a harmless condition where your urine or stool turns pink or red. This happens in 10% to 14% of the general population and is more common (up to 45%) in people with certain types of anemia or iron deficiency. It’s not dangerous, but it can be alarming if you’re not expecting it. If beeturia occurs frequently, it may be worth checking your iron levels, as it can signal absorption issues.
Beetroot is naturally high in oxalates, compounds that bind with calcium and can contribute to kidney stones. Beetroot juice contains 60 to 70 mg of oxalate per 100 ml, far higher than most other vegetable juices (which fall below 10 mg). About 75% of kidney stones are calcium oxalate stones, so if you have a history of kidney stones, you should be cautious with regular beetroot supplementation. The concentrated nature of pills means the oxalate load can add up quickly.
Beetroot supplements can also interact with blood pressure medications, potentially causing blood pressure to drop too low. People already on nitrate-based medications for heart conditions should be especially careful, since the mechanism of action overlaps.