Beetroot powder can lower blood pressure, primarily by reducing systolic pressure (the top number) by roughly 5 mmHg on average. The effect comes from naturally occurring nitrates in beets, which your body converts into nitric oxide, a molecule that relaxes blood vessels. The evidence is strongest for systolic blood pressure, while the effect on diastolic pressure (the bottom number) is less consistent across studies.
How Beetroot Lowers Blood Pressure
Beets are one of the richest dietary sources of inorganic nitrate. When you consume beetroot powder, the nitrate doesn’t do anything useful on its own. It first travels to your mouth, where bacteria on your tongue convert it into a related compound called nitrite. That nitrite then reaches your stomach, where the acidic environment transforms it into nitric oxide and other active molecules.
Nitric oxide is the key player. It passes through the walls of your blood vessels and signals the surrounding muscle cells to relax. Specifically, it triggers a chain reaction that pulls calcium out of those muscle cells, reducing their tension. The result is wider, more flexible blood vessels, which means your heart doesn’t have to push as hard to move blood through your body. That’s the drop in blood pressure.
This is the same pathway your body uses naturally to regulate blood vessel tone. Beetroot powder simply provides extra raw material for the process. One important detail: because the conversion depends on oral bacteria, using antibacterial mouthwash can actually blunt the blood pressure benefit by killing the bacteria needed for that first step.
What the Numbers Show
A systematic review and meta-analysis evaluated beetroot juice against placebo using European hypertension guidelines as a framework. The pooled result was a reduction in systolic blood pressure of about 5.3 mmHg. That may sound modest, but population-level data consistently shows that even a 5 mmHg systolic reduction is associated with meaningful decreases in stroke and heart attack risk.
The diastolic side of the equation is less clear. The same meta-analysis found no statistically significant effect on diastolic blood pressure or on 24-hour ambulatory blood pressure readings. The variability between studies was also moderate to high, meaning individual responses differ quite a bit. Some people see a noticeable drop, others very little.
A pilot study in healthy older adults found reductions of about 6 mmHg systolic and 4 mmHg diastolic after two weeks of daily beetroot juice. However, those improvements began to fade between weeks two and four, and the changes in blood pressure tracked closely with circulating nitrate levels. When nitrate levels dipped, blood pressure crept back up. This suggests the benefit requires consistent daily intake rather than occasional use.
How Quickly It Works
The blood pressure effect isn’t something you need to wait weeks to notice. Research has documented measurable improvements in blood vessel function as early as two hours after a single dose. The acute response peaks within a few hours of ingestion, driven by the rapid conversion of nitrate to nitric oxide in the gut.
For sustained reductions, the best results in studies tend to appear around the two-week mark of daily use. But the effect doesn’t necessarily keep building beyond that. In the pilot study of healthy older adults, blood pressure improvements plateaued at two weeks and slightly reversed by week four, likely because the participants were already healthy and had limited room for improvement. People with elevated blood pressure at baseline tend to see more pronounced and durable effects.
Dosage and What Form to Use
Most studies showing blood pressure benefits use a daily nitrate dose in the range of 300 to 550 mg. One standardized beetroot extract product used in a 12-week safety trial provided about 548 mg of nitrate per day (from 20 grams of powder, split into two 10-gram servings mixed with water). That amount was well tolerated in older adults with no significant safety concerns.
The form you choose matters more than you might expect. Research comparing beetroot supplements to whole beets found that a typical 100-gram serving of fresh beetroot delivers more nitrates, nitrites, and antioxidants than most capsule, tablet, or powder supplements taken at the manufacturer’s recommended dose. Powders came closer to matching fresh beets than capsules or tablets did, but they still generally fell short. If you’re using a powder, you may need a more generous serving than what’s printed on the label to match the nitrate content of whole beets or concentrated juice.
Concentrated beetroot juice (the kind sold in small “shots”) tends to have the most consistent nitrate content and is what most clinical trials have used. If you prefer powder for convenience, look for products that list nitrate content on the label so you can compare.
Side Effects and Practical Concerns
The most common and noticeable side effect is beeturia: red or pink discoloration of your urine or stool. This affects 10% to 14% of the general population, and the rate jumps to around 45% in people with certain types of anemia. Beeturia is completely harmless. The color comes from betacyanin, the same pigment that makes beets red. If it catches you off guard, it can look alarming, but it has no health implications and resolves once you stop consuming beets.
Beets are naturally high in oxalates, which can contribute to calcium oxalate kidney stones in susceptible individuals. If you have a history of kidney stones, it’s worth factoring in the additional oxalate load from a daily beetroot supplement.
Gastrointestinal discomfort is occasionally reported, particularly at higher doses. Starting with a smaller serving and increasing gradually can help.
Interactions With Medications
Because beetroot works through nitric oxide, it can amplify the effects of other substances that lower blood pressure or widen blood vessels. The most important interaction to be aware of involves nitrate-based medications prescribed for chest pain (angina). These drugs work through the same nitric oxide pathway, and combining them with high-dose dietary nitrates could cause a dangerous drop in blood pressure.
Medications for erectile dysfunction also act on a related pathway. The NHS notes that nitrates are specifically flagged as a concern with these drugs. If you’re taking any blood pressure medication, the combination with beetroot isn’t necessarily dangerous, but it could make the medication’s effect stronger than expected, increasing the chance of dizziness or lightheadedness. Your prescriber can help you gauge whether the combination is appropriate for your situation.
Who Benefits Most
The blood pressure response to beetroot is not uniform across all people. Those with elevated or high blood pressure at baseline tend to see the largest reductions. In studies of healthy adults with already-normal blood pressure, the effects are smaller and sometimes not statistically significant. The 12-week safety trial using 548 mg of nitrate daily, for instance, found no significant blood pressure changes, but its participants were generally healthy older adults rather than people with hypertension.
Age also plays a role. Older adults naturally produce less nitric oxide, which is one reason blood pressure tends to rise with age. Supplementing with dietary nitrate can partially compensate for this decline, making beetroot powder a reasonable strategy for older adults looking to support cardiovascular health alongside other lifestyle measures like exercise and dietary changes. The American Heart Association has highlighted research supporting the inclusion of nitrate-rich vegetables as part of broader dietary approaches to managing blood pressure.