When Is the Best Time to Take Beet Root?

For exercise performance, the best time to take beetroot is roughly two to three hours before your workout or event. That window aligns with when plasma nitrite levels peak after you consume a nitrate-rich beetroot product, and nitrite is the compound your body converts into nitric oxide, the molecule behind most of beetroot’s benefits. But the answer shifts depending on your goal. If you’re after lower blood pressure or faster recovery from hard training, the timing looks different, and daily consistency may matter more than hitting a precise pre-activity window.

Why Two to Three Hours Before Exercise

When you drink beetroot juice or swallow beetroot powder, you’re consuming inorganic nitrate. That nitrate gets absorbed in your gut, circulates in your blood, and is concentrated in your saliva. Bacteria on the back of your tongue then convert the nitrate into nitrite, which gets swallowed again and eventually reduced to nitric oxide throughout the body.¹ This roundabout process, called the enterosalivary pathway, is why there’s a delay between swallowing beetroot and actually feeling its effects.

Research tracking blood levels after a beetroot dose consistently shows that plasma nitrate peaks at about two hours and plasma nitrite peaks at roughly three hours.² Both remain elevated for several hours afterward. In one pharmacokinetic study, plasma nitrite was still significantly above baseline six hours after drinking beetroot juice.³ So you don’t need to be obsessively precise. Anywhere in the two-to-three-hour window gives you elevated nitrite during exercise, and you still have a buffer on either side.

Endurance Exercise Timing

Most of the performance research on beetroot has focused on endurance activities like running, cycling, and rowing. A systematic review of supplementation in endurance athletes concluded that the dose should be taken roughly 90 minutes before competition, without the use of antibacterial mouthwash.⁴ Some individual studies have used a 2.5-hour pre-exercise window and still observed physiological changes.⁵ The practical takeaway is that anywhere from 90 minutes to two and a half hours before your session puts you in the right zone for endurance work.

An umbrella review pooling results from multiple meta-analyses found that acute beetroot supplementation taken two to three hours before exercise produced a statistically significant but small improvement in physical performance.⁶ “Small” in research terms doesn’t mean useless. In competitive endurance sports, small edges in efficiency and time-to-exhaustion can separate finishing positions. But if you’re a recreational exerciser, temper your expectations. You probably won’t feel a dramatic difference from a single dose.

Resistance Training and Power

The evidence for strength and power sports is more mixed but still points to a similar timing strategy. Studies on resistance exercise typically administer beetroot two to two and a half hours before the session. A meta-analysis examining back squat and bench press performance found that nitrate supplementation taken in this window significantly improved repetitions to failure.⁷ One study comparing beetroot juice to creatine found that both improved peak velocity during incremental resistance exercises when taken two hours before training.⁸

That said, a recent dose-response study in resistance-trained men found no improvement in countermovement jumps, squats, or bench press at any of the doses tested.⁹ The picture for strength work is genuinely messy. The benefits seem more consistent for muscular endurance, meaning higher-rep sets with moderate loads, than for maximal strength. If your training involves sets of 10 or more reps, you’re more likely to notice an effect than if you’re doing heavy singles and triples.

Should You Take It Every Day or Just Before Exercise

This is one of the bigger practical questions, and the answer depends on what you’re trying to achieve. A single dose two to three hours before exercise can boost acute performance, as noted above. But some evidence suggests that loading for several days beforehand produces additional or different benefits.

In a study of older patients with heart failure, a single acute dose of beetroot juice did not improve submaximal aerobic endurance, but one week of daily dosing improved it by about a quarter. Both the single dose and the week-long regimen lowered resting blood pressure.¹⁰ A review of intermittent high-intensity exercise found that beetroot given either as a single dose or over a few days could improve performance during short, repeated bursts of effort.¹¹ And a review focused on endurance sports recommended a chronic protocol of three to seven days, ideally at higher nitrate doses, for optimal performance gains.¹²

If you have a big race or competition coming up, the best strategy is probably to start taking beetroot daily for several days beforehand and then take an additional dose in that two-to-three-hour window on race day. For everyday training, a single pre-workout dose is the simpler and more common approach. The evidence doesn’t strongly favor one strategy over the other for routine workouts, so convenience should guide you.

Timing for Blood Pressure

Many people take beetroot supplements not for athletic performance but for cardiovascular health, particularly blood pressure. Here the timing question shifts from “when before exercise” to “when during the day” and “how consistently.”

In a randomized, placebo-controlled trial of disease-free adults, systolic blood pressure showed a trend toward reduction about six hours after drinking beetroot juice, with a statistically significant drop of about 4 to 5 mmHg observed in the male subgroup.¹³ A pilot study in healthy older adults found that two weeks of daily beetroot juice reduced systolic blood pressure by about 6 mmHg and diastolic pressure by about 4 mmHg.¹⁴

For blood pressure purposes, consistency matters more than a precise clock time. Taking your beetroot at roughly the same time each day is reasonable. Morning is a common choice because blood pressure naturally rises after waking, but no study has directly compared morning versus evening dosing for long-term blood pressure outcomes. What the research does suggest is that daily use over at least two weeks produces more reliable effects than one-off doses. If you’re using beetroot specifically for blood pressure, think of it less like a pre-workout supplement and more like a daily habit.

Recovery After Exercise

A newer area of research involves using beetroot after exercise to speed recovery from muscle damage. This flips the timing question entirely: instead of taking it before you train, you take it afterward.

A systematic review found that short-term beetroot supplementation has the potential to reduce muscle soreness and accelerate the recovery of functional measures like strength and jump height after exercise-induced damage.¹⁵ In a study of female volleyball players, two days of beetroot juice supplementation after a damaging exercise protocol reduced perceived muscle soreness and improved wall-sit performance compared to placebo.¹⁶ A dose-response meta-analysis suggested that the antioxidant content of beetroot, rather than the nitrate itself, may be what drives reductions in a common marker of muscle damage.¹⁷

Not every study agrees. When experienced marathon runners consumed beetroot juice for three days following a marathon, it did not reduce inflammation or muscle damage markers compared to placebo.¹⁸ The researchers noted that these runners had completed around 16 marathons each and showed relatively little muscle damage to begin with, suggesting beetroot’s recovery benefits may be more apparent when the exercise actually causes substantial tissue damage. If you’re a well-adapted endurance athlete, post-exercise beetroot may not add much. If you’re training hard with unfamiliar movements or high eccentric loads, it could help.

Mouthwash Can Cancel the Whole Thing Out

This is the single most underappreciated factor in beetroot timing, and it has nothing to do with when you swallow the supplement. As described earlier, the bacteria on your tongue are essential for converting nitrate into nitrite. If you kill those bacteria with antibacterial mouthwash, you shut down the pathway before it starts.

A study testing several commercial mouthwash products, including Listerine, Cepacol, and chlorhexidine, found that all of them reduced the rise in salivary and plasma nitrite after a beetroot dose.¹⁹ Separate research confirmed that both strong and weak antibacterial agents suppress the plasma nitrite increase that follows a high-nitrate diet, and strong agents can even affect the blood pressure response during exercise.²⁰ A review in the intensive care literature went further, noting that because antiseptic mouthwashes eradicate oral bacterial flora, the entire nitric oxide-generating pathway can be abolished.¹

The practical rule: do not use antibacterial mouthwash in the hours surrounding your beetroot dose. If you use mouthwash as part of your morning routine, either switch to a non-antibacterial rinse or move your mouthwash timing away from your supplementation window. Brushing your teeth with regular toothpaste is fine. It’s the antibacterial agents, particularly chlorhexidine and cetylpyridinium chloride, that do the damage.

The Form You Take Affects How Much Nitrate You Actually Get

Timing is only useful if you’re getting a meaningful dose, and the form of beetroot you choose introduces a surprising amount of variability. An analysis of commercially available beetroot products marketed to athletes found massive differences in nitrate content. Powders had the highest nitrate concentration, followed by concentrates, while mixed drinks and bulk juices were considerably lower.²¹ Even more concerning, there was nearly a 50-fold range in nitrate content between different products, and samples of the same product varied by an average of 30%.

This matters for timing because the pharmacokinetics research, and therefore the “take it two to three hours before” advice, was mostly conducted using standardized concentrated beetroot shots with a known nitrate content, typically around 6 to 13 mmol. If you’re drinking a large glass of fresh beet juice from a juicer, you may be getting much less nitrate than a concentrated shot provides, and the larger fluid volume could change how quickly it absorbs. If you’re using a powder mixed into a smoothie with protein and fats, absorption could be slower still. The timing window of two to three hours was established using concentrated products, so the closer your product is to that format, the more confidently you can trust the timing.

Dose and Diminishing Returns

The dose-response relationship for beetroot is not perfectly linear. Research tracking plasma levels across multiple doses found that nitrate in the blood increased in a dose-dependent manner, but nitrite, the form that actually matters for nitric oxide production, plateaued at moderate doses. Moving from a moderate to a very high dose did not produce further increases in plasma nitrite.⁹ There appears to be a ceiling on how much nitrite your body can produce from a single dose, which means doubling up on beetroot shots right before a race is unlikely to give you twice the benefit.

Most positive studies have used doses in the range of about 6 to 13 mmol of nitrate, which translates to roughly 400 to 800 mg. The long-term supplementation study tracking plasma levels over several weeks found enormous percent increases in plasma nitrate and nitrite from a single high-nitrate dose, but individual variability was striking, with some participants converting nitrate to nitrite far more efficiently than others.²² Your personal response depends on your oral microbiome, your baseline dietary nitrate intake, and factors researchers are still sorting out.

Combining Beetroot With Caffeine

Since many athletes take both beetroot and caffeine before training, the question of stacking them comes up frequently. A study in semi-professional soccer players tested beetroot juice plus caffeine taken together before an intermittent exercise test. The combination did not improve performance beyond what either supplement achieved alone. More problematically, the beetroot-plus-caffeine combination increased gastrointestinal distress compared to double placebo.²³ If you typically take caffeine before training and want to add beetroot, be aware that the combo may cause more stomach upset without adding performance on top.

From a practical standpoint, if you’re going to use both, you don’t need to take them at the same time. Caffeine peaks in your blood within about 30 to 60 minutes, while beetroot needs two to three hours. Taking your beetroot first and your caffeine closer to the session avoids dumping both into your stomach simultaneously and reduces the chance of GI issues.

Older Adults and People With Cardiovascular Concerns

Beetroot supplementation may actually be more effective in older adults and in people with existing cardiovascular dysfunction, though the research is still in early stages. An animal study found that beetroot juice improved vascular endothelial dysfunction in aged mice by boosting nitric oxide availability and reducing oxidative stress.²⁴ The pilot study in healthy older adults that found blood pressure reductions also noted improved blood vessel function, and the researchers observed that the improvements were likely to be even greater in people who already have endothelial dysfunction.¹⁴

For older adults taking beetroot for general cardiovascular health rather than athletic performance, the timing emphasis shifts from “before exercise” to “daily and consistent.” The study in heart failure patients showing a 24% improvement in submaximal endurance required a full week of daily dosing.¹⁰ If you’re an older adult interested in beetroot for vascular health, think of it as a daily dietary supplement rather than a one-time performance booster. The specific hour matters less than the habit of taking it every day. One caveat: if you’re on blood pressure medication, talk to your prescriber before adding a supplement that also lowers blood pressure.

Simulated Altitude and Hypoxic Conditions

You might expect beetroot to shine in low-oxygen environments, since its nitric oxide boost could theoretically compensate for reduced oxygen availability. The reality is less clear. A systematic review examining beetroot supplementation under hypoxic conditions, simulating an altitude of about 2,500 meters, found no positive effect of either acute or chronic supplementation on performance variables.⁴ This is a genuinely surprising result that has left researchers looking for explanations. It may be that the mechanisms through which beetroot improves performance at sea level, primarily improved blood flow and oxygen efficiency, are overwhelmed by the physiological stress of altitude. If you’re headed to altitude for training or competition, beetroot timing may be a moot point until more research clarifies whether it helps at all in those conditions.