beetroot juice blood pressure: Forget pills? This humble vegetable juice slashes blood pressure in just 14 days, biggest study ever
What surprised the researchers most was where the change began; not in the heart, but in the mouth. The study suggests that bacteria living in the mouth may play an important role in helping the body process nitrate-rich foods and supporting healthy blood vessels during aging.
For years, beet juice has been linked to heart health, but this latest research offers a clearer explanation of why beets may help some people more than others. According to a report by Science Daily, scientists discovered that the drink alters bacteria in the mouth in ways that increase the body’s ability to produce nitric oxide, a molecule important for blood vessel health.
The findings were published in the journal Free Radical Biology and Medicine and were described as the largest study to date examining the relationship between dietary nitrate, oral bacteria, nitric oxide biology and blood pressure in both young and older adults.
Why is the mouth important for blood pressure?
Nitrate is naturally found in vegetables such as beets, spinach, arugula, fennel, celery and kale. Nitrate interacts with bacteria in the mouth before helping the body. Some microbes convert nitrate into compounds that promote nitric oxide production.
Nitric oxide helps blood vessels relax and function properly, making it important for blood pressure regulation and overall cardiovascular health.
Researchers found that the nitrate-to-nitric oxide switch may work less effectively when the balance of oral bacteria changes. Beetroot juice has been shown to improve this balance in older adults, Science Daily reports.
What happened during the beet juice study?
39 adults under the age of 30 and 36 adults in their 60s and 70s participated in the trial. Participants completed two separate two-week phases. At one stage they drank nitrate-rich beetroot juice twice a day. In the other, they consumed a placebo version with nitrate removed.
The researchers also added a two-week washout period between each phase to reset conditions before testing the next drink.
Using bacterial gene sequencing, scientists examined how the oral microbiome changed after each stage.
Both young and older adults experienced changes in their oral bacteria after drinking beetroot juice, but the effects were very different between groups, Science Daily reports.
Why did older adults respond differently?
Among the older participants, the researchers noticed a decrease in Prevotella, a type of bacteria identified as potentially harmful in this environment. At the same time, beneficial bacteria, including Neisseria, have also become more common.
The older group also entered the study with higher blood pressure levels than younger participants. After consuming nitrate-rich beetroot juice, their blood pressure dropped noticeably. This improvement was not seen with the placebo drink, nor was it seen in young adults.
Researchers believe the results may be linked to aging and nitric oxide production. As people get older, the body naturally produces less nitric oxide, which can affect blood vessel function and circulation, according to a report from Science Daily.
Study author Professor Anni Vanhatalo, from the University of Exeter, said: “We know that a nitrate-rich diet has health benefits, and older people produce less of their own nitric oxide as they get older. They also tend to have higher blood pressure, which can be associated with cardiovascular complications such as heart attack and stroke. Encouraging older adults to consume more nitrate-rich vegetables can have significant long-term health benefits. The good news is that if you don’t like beetroot, there are many nitrate-rich alternatives.” There are: spinach, arugula, fennel, celery and kale.”
The researchers also noted follow-up studies that further explored the link between oral bacteria and nitrate processing. A 2025 randomized crossover study involving older adults treated for high blood pressure found that nitrate-rich beet juice increased Neisseria while decreasing Veillonella in the mouth.
Another pilot study in 2026 found that chlorhexidine antiseptic mouthwash disrupted nitrate processing and reduced nitric oxide production; This reinforced the idea that oral bacteria play an important role in cardiovascular health.
Co-author Professor Andy Jones, from the University of Exeter, said: “This study shows that nitrate-rich foods alter the oral microbiome in ways that may result in less inflammation as well as lowering blood pressure in older people. This paves the way for larger studies to investigate the impact of lifestyle factors and biological sex on how people respond to dietary nitrate supplementation.”
Researchers emphasized that beet juice is not a substitute for medication or standard treatment. Still, the findings suggest that nitrate-rich vegetables may be an important part of healthy aging and blood pressure management.
The study also highlighted a growing idea in nutritional science: two people can eat the same foods and experience very different health effects because their oral microbiomes process nutrients differently.
FAQ
How long did it take for beet juice to lower blood pressure?
Older adults in the study saw changes after two weeks.
Why is beet juice thought to be beneficial for blood pressure?
It contains nitrate, which helps support the production of nitric oxide in the body.
