Beet juice has become a kind of wellness celebrity, appearing in bright purple bottles at gyms, in smoothie bowls, and in eager Instagram posts promising everything from faster sprints to lower blood pressure. There is something satisfying about the idea that a humble root vegetable could unlock better workouts and keep your heart healthy, as if nature had hidden a performance-enhancing drug inside something you can roast for dinner. And there is real science underneath that glow: beets are rich in nitrate, a compound that can enter the body’s nitric oxide pathways. Nitric oxide is central to how blood vessels relax, and it has deservedly won a Nobel Prize for its role in the cardiovascular system. But from there, the story often runs off the rails. The uncomfortable truth is that the same molecule can do very different things depending on where it is made, how much of it exists, and how long it lives. While beets can genuinely help some athletes go harder or recover faster in very specific conditions, using them as a treatment for high blood pressure is a stretch that neither the biology nor the clinical evidence supports. The excitement is understandable, but the nuance matters—and in this case, it can make all the difference between a useful dietary choice anda false promise.
The confusion begins with understanding how nitrate actually works inside the body, because the path from a sip of beet juice to a molecule of nitric oxide is not a simple highway. Nitrate is not nitric oxide; it has to be converted. The first step happens mostly in the mouth, where certain bacteria produce an enzyme that reduces nitrate to nitrite. Then, under the right conditions, nitrite can be converted into nitric oxide—but the right conditions are quite particular. Nitric oxideis not a hormone that floats through the bloodstream to deliver relaxation signals at distant tissues. It is an exquisitely local signal, with a half-life measured in milliseconds, especially when hemoglobin is around. As soon as nitric oxide meets hemoglobin, it is oxidized back to nitrate, so it simply cannot travel far from where it was made. The places where nitrite-to-nitric oxide conversion are most likely to happen are acidic, oxygen-poor environments. In hard-working exercising muscle, exactly those conditions exist: oxygen is being consumed, pH drops, and localischemia can occur. That helps explain why nitrate can improve performance in intense aerobic efforts like cycling, distance running,or swimming—the working muscle itself creates the conditions needed to unlock local benefits. But those localized effects in a hard-working thigh are very different from the body-wide relaxation of small arteries that would be needed to meaningfully treat hypertension.
The legitimate evidence for beets indeed lives in sports physiology, not in cardiology. Researchers, especially in the UK and Scandinavia, have shown that beetroot juice can improve cardiovascular performance in sports, particularly in exercises with intense aerobic demands. In those settings, nitrate appears to support working muscles by increasing local blood flow, helping deliver oxygen and nutrients while clearing metabolic byproducts. But even this effect is not universal. In a study involving people with chronic obstructive pulmonary disease, even a four-fold increase in plasma nitrate had no effect on blood pressure or performance, a reminder that context matters enormously. My own research team explored whether the performance benefit extended to strength training. In one study, a bar product combining beets with antioxidants improved muscle performance and recruitment—but importantly, it did so without changing blood pressure. That is a perfect illustration of the local-versus-systemic distinction: hard-working muscles can tap into the nitrate-nitrite-nitric oxide pathway for a boost, yet the same intervention produces no measurable effect on the body’s overall vasodilation. When it comes to hypertension, the clinical evidence is weak and inconsistent. Some aerobic exercise studies have observed small reductions in systolic blood pressure, often in the range of 2 to 4 mmHg, while others show no effect at all. A large meta-analysis of beet and beet-juice interventions found a small effect on systolic blood pressure, but no effect on diastolic pressure, mean arterial pressure, or 24-hour blood pressure measurements. The authors concluded there is no evidence for a prolonged 24-hour blood pressure reduction, and the certainty of that evidence is low. For sports performance, the nitrate story has value; for hypertension, it is often taken out of context.
To understand why beets don’t lower blood pressure the way people hope, it helps to look atwhat blood pressure measurements actually mean, and where nitric oxide fits in. Nitric oxide reduces blood pressure by acting as a vasodilator, meaning it relaxes the muscle in the walls of blood vessels and lowers vascular resistance. When you measure diastolic blood pressure—the lower number, the pressure when the heart relaxes—you are getting a direct window into that systemic arterial resistance, because diastolic pressure reflects how much resistance the blood vessels still maintain while the heart is refilling. In contrast, systolic blood pressure—the higher number—represents the pressure when the heart contracts, layered on top of that baseline resistance. So if beets were truly causing widespread nitric oxide production and vasodilation throughout the body, you would expect to see diastolic blood pressure drop. Again and again, however, studies with beets find no significant effect on diastolic pressure or mean arterial pressure. That means vascular resistance is not actually being changed in any meaningful systematic way. The nitric oxide produced from dietary nitrate is confined, transient,and local, generated in muscles that need a little extra blood flow, not throughout the entire circulatory tree. It cannot behave like a circulating hormone, reaching every vessel and relaxing them all. Nitric oxide is far too reactive and short-lived for that. To have a real blood pressure-lowering effect, you would need a substantially larger, sustained, body-wide production of nitric oxide—the kind that life-saving vasodilator drugs like nitroglycerin and nitroprusside can provide, or the kind that goes dramatically wrong in septic shock, when excessive nitric oxide production causes blood pressure to crash and organs to fail. Beets are nowhere near that league.
There is also a cultural and emotional dimension to this story that makes it worth stepping back from the science. Nobody wants hypertension to be treated with another pill; there is a deep, passionate hope that food can be medicine, that a simple dietary change can fix a condition that affects nearly half of all adults and is a leading cause of heart disease, stroke,and kidney failure. That hope is not foolish, and it is true that whole foods, vegetables, and a balanced diet are foundational for health. But the phrase “food is medicine” can become a narrative that overshadows complexity and assigns powers to single foods that they don’t actually possess. People want beets to lower blood pressure because the alternative—taking a pharmaceutical forever, with side effects and costs—is unpleasant. But the biochemistry does not bend to preference. A beet contains nitrate, but nitrate is not a carefully designed, dose-controlled drug; it depends on oral bacteria, stomach acid, local oxygen levels, hemoglobin, and countless other variables. Nitroglycerin, discovered more than a century ago, works as a powerful vasodilator because it delivers nitric oxide directly to vascular smooth muscle in a pharmaceutical formulation, not because it resembles food. The Nobel Prize-winning discovery of nitric oxide signaling from L-arginine through enzymes called nitric oxide synthases gave scientists a precise map of how the body generates this molecule under tightly regulated conditions—but dietary nitrate bypasses that map entirely, operating through separate, context-dependent biochemical side roads. This nuance gets lost in the enthusiastic sharing of clickbait headlines, and as a result a false narrative spreads: eat beets, lower blood pressure. That narrative can be harmful if it leads people with hypertension to delay medical treatment, replace proven therapies with beet juice, or believe that their blood pressure is managed when it isn’t
So what should we take away from all of this? Not that beets are worthless, and not that nutrition is irrelevant. Eat beets. They are delicious, full of fiber, vitamins, antioxidants, and they may give you a small edge in a hard workout, especially if you are a cyclist, a distance runner,orsomeone whose muscles are working near their oxygen limits. Beets can be part of a healthy diet, and a healthy diet is part of a healthy blood pressure picture. But hypertension is a complex, persistent, often silent challenge, and it should not be left to a root vegetable or a juice shot. The evidence simply does not support the claim that nitrate-rich beets are a reliable systemic treatment for high blood pressure. The physiology is too local, too transient, too conditional. The clinical trials, taken together, show at most a modest and inconsistent effect on systolic pressure, with no effect on diastolic, mean, or 24-hour readings. Science should give us honest comfort, not just convenient comfort. Mark JS Miller, a pharmacologist who has spent his career studying nitric oxide and related nitrogen molecules in health and disease—in cardiovascular function, inflammation, sepsis, fetal development, sports performance, and more—has seen time and again how nitric oxide’s power depends on precise contextie. He knows that NO can save a life if placed exactly where it is needed, and destroy a life if produced without limits. That is the same lesson from beets: context is everything. The humble beet can certainly help you push through a workout. It just shouldn’t be treated as your blood pressure medication.