Beet Juice: The Nitrate Effect Athletes Swear By

Stand near the front of any 10K starting corral these days and you’ll spot them: runners tipping back small bottles of something the color of a magenta highlighter, wincing slightly, then tucking the empties into their waistbands. Twenty years ago that ritual belonged to a handful of exercise physiologists and their lab volunteers. Now it’s as common as pre-race stretching.

Sports nutrition has a long history of fads that dissolve under scrutiny. This one is different. The physiology behind beetroot juice is real, well mapped, and genuinely interesting: it involves a molecule that won its discoverers a Nobel Prize and a colony of bacteria living on your tongue.

What the research does not support is the internet’s grander version of the story, where beet juice detoxifies your liver, rebuilds your blood, and replaces medication. Here’s what a glass of it actually does, who benefits most, and who should leave it on the shelf.

Why do athletes swear by beet juice?

The short answer is a three-letter molecule: nitric oxide, or NO. In 1998, three scientists won the Nobel Prize in Physiology or Medicine for showing that this gas acts as a signal telling blood vessels to relax and widen. Wider vessels mean better blood flow, and better blood flow means more oxygen delivered to working muscle.

Beets happen to be one of the richest food sources of dietary nitrate, the raw material for nitric oxide. The conversion is a small relay race. You drink the juice, and bacteria living on the back of your tongue reduce nitrate to nitrite. You swallow that nitrite, and in the acidic environment of the stomach, and later in tissues where oxygen runs low, it converts to nitric oxide. Low-oxygen conditions are exactly what a hard-working muscle experiences mid-workout, which is why the effect shows up when it’s most useful.

There’s a second mechanism that intrigues researchers even more. In several trials, nitrate supplementation reduced the oxygen cost of exercise by roughly 3 to 5 percent, meaning volunteers pedaled at the same intensity while burning measurably less oxygen. That suggests nitric oxide makes mitochondria, the cell’s energy factories, run slightly more efficiently. Almost nothing legal does that, which explains why sports scientists paid attention long before juice bars did.

Can beetroot juice lower blood pressure?

Yes, modestly and temporarily, and this is the best-supported claim in the entire beet juice story. A 2013 meta-analysis in the Journal of Nutrition pooled 16 trials and found that inorganic nitrate and beetroot juice lowered systolic blood pressure (the top number) by an average of about 4.4 mmHg. The effect typically peaks two to three hours after drinking and fades within roughly 24 hours, which is why studies use a daily glass rather than an occasional one.

Four points may sound trivial. It isn’t. At the population level, even small sustained reductions in systolic pressure translate into meaningfully lower rates of stroke and heart disease, and nearly half of American adults have blood pressure in the elevated or hypertensive range, according to the CDC. A vegetable that nudges the number in the right direction, with no known downside for most people, is worth taking seriously.

Two honest caveats. First, most trials were short, days to weeks, so we know less about whether the effect holds up over years. Second, beet juice is a supporting player, not a treatment. If you’ve been prescribed blood pressure medication, the juice belongs alongside it, never instead of it, and your care team should know you’re drinking it regularly, since the effects can add together.

What happens if you drink beetroot juice for 7 days?

A week is long enough to see the real effects and short enough to keep expectations honest. Based on what controlled trials measure, here’s the realistic timeline.

Within hours of the first glass, blood nitrate and nitrite levels rise several-fold, and blood pressure dips slightly, bottoming out around the two-to-three-hour mark. By day two or three of daily drinking, that small reduction becomes fairly steady, because you’re topping up nitrate before yesterday’s dose fully wears off. Some endurance studies use exactly this kind of multi-day loading and find that time to exhaustion improves, volunteers last noticeably longer at a fixed hard pace than they did on placebo juice.

You’ll likely notice cosmetic changes too. Ten to 14 percent of people develop beeturia, pink or reddish urine, and reddish stools are common and harmless. Your grocery bill rises, and so does your sugar intake: an eight-ounce glass carries roughly 20 grams of natural sugars, about what you’d get from a medium banana and a half.

What won’t happen in seven days: dramatic weight change, “detoxification,” visibly different skin, or a cure for anything. When the week ends, so do the effects, nitrate doesn’t accumulate the way some nutrients do. Whatever benefit you get is rented, not owned, which is the strongest argument for treating beets as a regular food rather than a short experiment.

Is it healthy to drink beetroot juice daily?

For most healthy adults, yes: a daily glass is safe and reasonable, and daily use is actually how the blood pressure benefit works, since the effect resets within about a day. But “safe for most” comes with genuine footnotes.

Sugar is the first. Juicing strips out the fiber that slows sugar absorption in a whole beet, so a glass delivers its carbohydrates quickly. People tracking blood sugar should count it like any other juice. The second footnote is oxalate: beets are among the higher-oxalate foods, and oxalate is the main ingredient in the most common type of kidney stone. If you’ve formed a calcium-oxalate stone before, daily beet juice is a poor habit to adopt without medical advice.

The third is potassium. Beet juice is a decent source, which is a virtue for most people, MedlinePlus notes potassium helps counter sodium’s effect on blood pressure, but a liability for anyone with advanced kidney disease whose kidneys can’t clear the excess.

One more practical point: variety beats devotion. Arugula, spinach, lettuce, and celery are also nitrate-rich, and rotating vegetables spreads out both the benefits and the small risks of any single food. A daily beet habit is fine; a daily beet monoculture is a missed opportunity.

What organ is beet juice good for?

If you have to pick one, pick the blood vessels, roughly 60,000 miles of them, enough to circle the Earth twice. The endothelium, the whisper-thin lining of every artery and vein, is where nitric oxide does its work, signaling the surrounding muscle to relax. Because vessels serve every organ, the benefits radiate outward: the heart pumps against slightly less resistance, and working muscles receive blood a bit more easily. This is why cardiologists, not just sports scientists, find the nitrate research interesting.

The brain is the most promising runner-up. Small studies in older adults have found that nitrate-rich diets increased blood flow to the frontal lobes, regions involved in decision-making and attention. It’s an intriguing signal, but the trials were brief and small, call it preliminary, not proven.

The liver is where the marketing outruns the evidence. Beets contain betaine, a compound studied in animals for effects on fat accumulation in the liver, and wellness sites have inflated that into “liver detox” claims. Human evidence is thin, and the concept of food-based detoxing doesn’t hold up anyway: your liver and kidneys detoxify continuously without dietary assistance.

And the kidneys cut both ways: the potassium and the blood-pressure nudge are friendly to healthy kidneys, while the oxalate load is unfriendly to stone-prone ones. Context is everything.

Does beet juice actually make you faster?

Somewhat, and the fine print decides whether it’s worth your while. A 2017 systematic review in the journal Nutrients examined beetroot juice trials in athletes and found consistent improvements in cardiorespiratory endurance: volunteers lasted longer before exhaustion and improved performance at anaerobic threshold. Across the broader literature, time-trial gains typically land in the 1 to 3 percent range.

For a recreational runner, 1 to 3 percent is real money, roughly 30 seconds to a minute and a half off a 50-minute 10K. Here’s the twist, though: the fitter you are, the less it helps. Elite endurance athletes, whose bodies already produce and use nitric oxide with ruthless efficiency, often show little or no benefit in studies. The weekend athlete gains more from beet juice than the Olympian does, which is a rare and rather democratic finding in sports nutrition.

Timing matters too. Because blood nitrite peaks two to three hours after drinking, that’s the window most protocols target before exercise. Several studies also suggest a few consecutive days of intake works better than a single pre-race glass.

The events that respond best are sustained efforts lasting several minutes to about half an hour, plus repeated-sprint sports like soccer. For a leisurely walk or a maximal single lift, the evidence is far weaker. Beet juice sharpens engines that run hard and long.

What's actually in a glass of beet juice?

An eight-ounce glass of unsweetened beet juice carries roughly 100 to 110 calories and 23 to 25 grams of carbohydrate, most of it natural sugar. That’s the trade-off of juicing: the sweetness of two to three whole beets, minus the 3 to 4 grams of fiber per cup that whole beets would have contributed.

The micronutrient list is respectable. You get a meaningful dose of potassium, useful for blood pressure regulation, plus folate, some vitamin C, manganese, and a modest amount of iron. The “beets rebuild your blood” folklore, incidentally, overstates that iron; the deep red color comes not from iron but from betalains, a family of pigments found in few other foods.

Betalains deserve a moment. They have antioxidant and anti-inflammatory activity in laboratory studies, and Cleveland Clinic dietitians point to them as one reason beets earn their reputation. Whether betalains produce measurable health effects at the amounts people actually drink is still an open question, lab-dish activity and human benefit are different claims.

The headline ingredient remains nitrate, and here’s a wrinkle worth knowing: nitrate content varies enormously with soil, season, and beet variety. One bottle can contain double the nitrate of another that looks identical, which is one reason study results vary and why researchers often use standardized concentrated juices rather than whatever the store carries.

Who should not drink beetroot juice?

Four groups should pause before making beet juice a habit.

• People with a history of calcium-oxalate kidney stones. Beets are high in oxalate, and calcium-oxalate stones account for the large majority of all kidney stones. The NHS specifically advises stone-formers to moderate oxalate-rich foods. Anyone who has passed a stone knows this is not a risk to take casually.
• People with advanced chronic kidney disease. Struggling kidneys can’t clear excess potassium, and beet juice adds to the load. Anyone on a renal diet should clear it with their kidney team first.
• People taking blood-pressure-lowering medication, or who run low pressure naturally. The juice’s effect and the medication’s effect can stack. That’s not automatically dangerous, but it can produce lightheadedness, especially on standing, and it’s a conversation worth having with your prescriber rather than an experiment to run alone.
• People closely managing blood sugar. With the fiber removed, a glass behaves like other fruit and vegetable juices: its roughly 20 grams of sugar arrive quickly and need to be counted.

Notice what’s not on the list: healthy adults, older adults with normal kidney function, and athletes. For them, the main hazards of beet juice are pink urine and stained countertops.

Why is my urine pink after beet juice, and is that dangerous?

Take a breath: it’s almost certainly beeturia, and it’s harmless. In roughly 10 to 14 percent of people, betalain pigments survive digestion, pass into the bloodstream, get filtered by the kidneys, and tint the urine anywhere from faint rosé to alarming crimson. Reddish stools happen the same way. Both effects fade within a day or two of the beets clearing your system.

Why some people and not others? Digestion chemistry seems to decide. Betalains break down in strongly acidic conditions, so people whose stomach environment degrades the pigment less completely absorb more of it intact. Some research has noted beeturia appears more often in people with iron deficiency, though the evidence is mixed and beeturia alone is not a reliable sign of anything.

The one genuinely important rule: red or pink urine when you haven’t eaten beets (or other strongly pigmented foods like blackberries or rhubarb) deserves a prompt call to your doctor. Blood in the urine can signal infection, stones, or other conditions that need evaluation, and it should never be explained away. If you’re unsure whether beets are the culprit, skip them for 48 hours; beeturia will disappear, actual blood will not.

File this under the same category as asparagus-scented urine: a quirk of individual chemistry, and a surprisingly common reason for panicked morning phone calls to clinics.

Juice, whole beets, or powder, does the form matter?

It matters more than the labels suggest. Each form makes a different trade.

Whole beets, roasted, steamed, or grated raw into salads, keep their fiber, which slows sugar absorption, feeds gut bacteria, and adds fullness. The catch is volume: getting a research-level nitrate intake from whole beets means eating more of them than most people comfortably will, day after day. Cooking method matters a little, too, boiling leaches some nitrate into the water you pour away, while roasting keeps more of it in the beet.

Juice concentrates the nitrate into a drinkable volume, which is precisely why researchers use it. The cost is the lost fiber and the faster-hitting sugar. Studies typically use one to two cups of standard juice, or small standardized concentrates, usually two to three hours before the effect is wanted.

Powders and capsules are the wild card. As with all dietary supplements, they’re regulated far less strictly than medications, and independent analyses have found the actual nitrate content of beet supplements varies widely from what marketing implies, some deliver very little. If a product doesn’t disclose its nitrate content, you’re buying a mystery.

The honest ranking: whole beets for everyday nutrition, juice when you specifically want the nitrate effect, and powders only with skepticism and a label you can verify.

The mouthwash problem: how to accidentally cancel your beet juice

Here’s the detail that best proves how well scientists understand this pathway: you can neutralize beet juice with oral hygiene products.

Remember that the first step of nitrate conversion happens on your tongue, where resident bacteria reduce nitrate to nitrite. Those bacteria are not optional. In controlled studies, when volunteers used strong antiseptic mouthwash, the rise in blood nitrite after a nitrate dose was sharply blunted, and the blood pressure benefit shrank with it. Other experiments asked volunteers to spit rather than swallow after nitrate sat in the mouth, with similar results. No tongue bacteria, no relay race, no nitric oxide boost.

The practical translation is simple. If you drink beet juice for its cardiovascular or performance effects, avoid antiseptic mouthwash in the hours around it. Regular brushing and flossing are fine: the concern is specifically the strong antibacterial rinses designed to sterilize the mouth.

There’s a broader lesson tucked in here that researchers find genuinely thought-provoking: the oral microbiome appears to participate in blood pressure regulation. Some scientists now ask whether habitual, aggressive mouthwash use could nudge blood pressure upward in certain people by suppressing nitrate-reducing bacteria; observational studies have raised the question without settling it. It’s early-stage science, not a reason to abandon oral hygiene, but it’s a vivid reminder that the bacteria we host are collaborators, not just passengers.

What beet juice won't do (and what it will)

Beet juice has become a screen onto which the wellness industry projects nearly everything. Sorting the claims by evidence quality tells a clearer story than any single headline.

The claim	What studies actually show	Evidence strength
Lowers blood pressure	Average systolic drop of about 4 mmHg in a pooled analysis of 16 trials; effect fades within roughly 24 hours	Strong (short-term)
Improves endurance	Roughly 1–3% gains in sustained efforts; strongest in recreational athletes, weakest in elites	Moderate
Supports brain blood flow	Increased frontal-lobe perfusion in small, short trials of older adults	Preliminary
Lowers cholesterol	Animal data and scattered small human studies; no convincing effect established	Weak
“Detoxes” the liver	No human evidence; the liver detoxifies continuously without dietary help	None
Treats or prevents cancer	Lab-dish betalain studies only; no clinical evidence in people	None

The pattern is worth internalizing because it repeats across nutrition: the closer a claim sits to a measurable, short-term physiological mechanism, vessel dilation, oxygen cost, the better it holds up. The grander the promise, the flimsier the file. Beet juice earns its place in the top two rows honestly. It doesn’t need the bottom four, and neither do you.

How to drink beet juice without wincing

The flavor problem has a name: geosmin, the same earthy compound that gives rain-on-dry-soil its smell. Some palates read it as pleasantly rustic; others as licking a garden. If you’re in the second camp, a few evidence-free but kitchen-tested strategies help.

• Cut it with brightness. Apple, orange, carrot, ginger, or a squeeze of lemon all mute the earthiness. A half-beet, half-apple blend is the classic gateway ratio.
• Serve it cold. Chilling suppresses geosmin’s aroma considerably. Room-temperature beet juice is an acquired taste few acquire.
• Roast first, then blend. Roasting caramelizes some of the beet’s sugars and softens the flavor. Blending rather than juicing also keeps the fiber.
• Start small. A large glass on an unaccustomed stomach can cause cramping or urgency in some people. Begin with a half-glass and let your gut vote.
• Eat your nitrate instead. Arugula and spinach are also excellent nitrate sources; a large arugula salad is a legitimate alternative for people who never make peace with the juice.

One housekeeping note that surprises first-timers: betalain pigment stains enthusiastically. Cutting boards, wooden spoons, fingertips, and light-colored countertops all deserve caution. A little lemon juice lifts fresh stains from skin; laminate is less forgiving.

However you take it, consistency beats heroics. A modest amount most days accomplishes more than a large ceremonial glass once a week.

When to talk to a doctor before making it a habit

Beet juice is food, not medicine, but a few situations genuinely warrant a conversation before you commit to a daily glass.

Bring it up with your care team if you take any medication that lowers blood pressure. The combined effect is usually small, but dizziness on standing is worth preventing rather than discovering, particularly for older adults, in whom a lightheaded moment can mean a fall. The same applies if your blood pressure already runs low without medication.

A history of kidney stones is the second flag, especially calcium-oxalate stones, which are the most common type. Your doctor or a dietitian can tell you whether your particular stone chemistry makes high-oxalate foods a real risk or a theoretical one: the answer differs from person to person. Anyone with chronic kidney disease should treat beet juice as a question for their renal team because of the potassium load.

See a doctor promptly, not eventually, if you notice red or pink urine and you haven’t eaten beets in the past two days, or if red urine comes with pain, fever, or burning. Beeturia is innocent; unexplained blood in the urine never is until proven otherwise.

Finally, if you’re drinking beet juice hoping to manage a diagnosed condition, say so out loud at your next appointment. The juice may well be a fine supporting habit. Your care team just needs to know it’s on the roster.

Frequently asked questions

Is it healthy to drink beetroot juice daily?

For most healthy adults, yes, daily use is actually how the blood pressure benefit works, since the effect fades within about 24 hours. The caveats: a glass carries roughly 20 grams of natural sugar with no fiber, beets are high in oxalate, and the potassium adds up. People with a history of kidney stones, advanced kidney disease, or blood-pressure-lowering prescriptions should check with their care team before making it a habit.

What happens if I drink beetroot juice for 7 days?

Expect modest, measurable changes rather than a transformation. Blood nitrate rises within hours, systolic blood pressure dips a few points and stays slightly lower with daily intake, and endurance may improve in the 1 to 3 percent range. Around one in ten people develops harmless pink urine, and reddish stools are common. When you stop, the effects fade within a day or so, nitrate doesn’t accumulate in the body.

Who should not drink beetroot juice?

Four groups should be cautious: people who have formed calcium-oxalate kidney stones, since beets are high in oxalate; people with advanced kidney disease, because of the potassium load; people on blood-pressure-lowering medication or with naturally low pressure, since effects can stack and cause lightheadedness; and people closely managing blood sugar, who need to count the juice’s roughly 20 grams of fast-absorbing sugar. Everyone else generally tolerates it well.

What organ is beet juice good for?

The blood vessels benefit most directly. Nitric oxide made from beet nitrate relaxes the endothelium, the lining of your arteries, which eases blood flow and modestly lowers blood pressure, indirectly helping the heart. Small studies also suggest improved blood flow to the brain’s frontal lobes in older adults, though that evidence is preliminary. Popular claims about liver “detoxing” are not supported by human research.

How long before exercise should I drink beet juice?

About two to three hours before, which is when blood nitrite levels peak after drinking. Most research protocols target that window. Several studies also suggest that drinking it daily for a few consecutive days before an event works better than a single pre-race glass. The benefit shows up mainly in sustained hard efforts lasting several minutes to about half an hour, and in repeated-sprint sports.

Does beet juice lower blood pressure immediately?

It works within hours, not minutes. Blood pressure typically begins dropping as nitrite levels rise, reaching its lowest point around two to three hours after drinking, then returning to baseline within roughly 24 hours. The average reduction in pooled trials was about 4 mmHg systolic, modest but meaningful over time. It is a supporting habit, never a substitute for prescribed blood pressure treatment.

Why is my urine pink after drinking beet juice?

That’s beeturia, a harmless quirk affecting roughly 10 to 14 percent of people. Betalain pigments from the beet survive digestion, enter the bloodstream, and get filtered into the urine, tinting it pink to red for a day or two. It requires no treatment. The important exception: red or pink urine when you haven’t eaten beets recently should always be evaluated by a doctor, since it can indicate blood.

Is beet juice better than eating whole beets?

It depends on your goal. Juice concentrates nitrate into a drinkable volume, which is why researchers use it for blood pressure and performance studies. Whole beets keep their 3 to 4 grams of fiber per cup, which slows sugar absorption and supports gut health, but you’d need to eat a lot of them to match research-level nitrate intakes. For everyday nutrition, whole beets win; for the targeted nitrate effect, juice is more practical.

Does beet juice have too much sugar?

It has a meaningful amount, roughly 20 grams of natural sugar per eight-ounce glass, similar to other fruit and vegetable juices, and without fiber to slow absorption. For most healthy people drinking one glass a day, that fits easily into a balanced diet. People managing diabetes or watching carbohydrates should count it like any juice, and blending whole beets instead of juicing keeps the fiber and softens the sugar hit.

Can mouthwash really cancel the benefits of beet juice?

Strong antiseptic mouthwash can substantially blunt them, yes. The first step of nitrate conversion depends on bacteria on your tongue that reduce nitrate to nitrite; killing those bacteria interrupts the chain, and studies show both the nitrite rise and the blood pressure effect shrink as a result. Normal brushing and flossing are fine. If you drink beet juice for the nitrate effect, just avoid antibacterial rinses in the surrounding hours.

References

• MedlinePlus: Potassium
• NHS: Kidney stones
• CDC: About High Blood Pressure

This article is for general information only and is not a substitute for professional medical advice. Please consult a qualified doctor about your individual situation.