Works afterAcute: a single dose taken 2–4 hours before exercise is ergogenic
Evidence22 papers read
Does it work?
The label shows how strong the evidence is, not how big the effect is. Tap a claim to see its papers.
The takeaway
In plain words
In recreational exercisers, expect small endurance gains: 25.3 s more time to exhaustion, 4.6 W more power and 163.7 m more distance on average. Race-style time trials did not improve significantly. For lifters, maximal power rises about 5% and reps to failure improve slightly (SMD 0.43 in squat and bench), but 1RM strength does not change meaningfully.[2][4][7][9][11]
The numbers
Overall ergogenic effectd = 0.17480 studies; recreationally active adults[1]
Time to exhaustion+25.3 smean difference vs placebo[4]
A small benefit (overall d = 0.174), clearest in time-to-exhaustion tests (ES 0.33). Time-trial performance, which is closer to racing, did not improve significantly.[1][2][3][4][5][6]
Several meta-analyses agree on a small ergogenic effect in non-athletes and recreationally active men, but results are mixed by test type: time-to-exhaustion improves while time trials do not reach significance. That mix fits Grade B rather than A.
Each plate is one paper. Taller = stronger study design, wider = more studies pooled. Tap one.
Nitrate clearly improves exercise performance in recreationally active young healthy men, but the effect is objectively small. It was not seen in well-trained endurance athletes or in women-only studies.
Studies pooled
80
Overall effect
d = 0.174 (95% CI 0.120 to 0.229)
Well-trained endurance athletes (≥65 mL/kg/min, n = 26)
d = 0.021 (95% CI −0.103 to 0.144), not significant
Women-only studies (n = 6)
d = 0.116 (95% CI −0.126 to 0.358), not significant
Nitrate improved power output, time to exhaustion and distance covered in endurance tasks, but not time-trial performance, work done or perceived exertion.
Nitrate's effects seem diminished above a VO2peak of about 60 mL/kg/min. Experts recommend 8–16 mmol acutely or 4–16 mmol/day chronically, last dose 2–4 h pre-exercise, ideally from vegetables. Most statements lacked sufficient evidence.
Only a few performance supplements, including caffeine, creatine, specific buffering agents and nitrate, have good evidence of benefit. Responses vary between individuals, and supplements should be trialled in training first.
A modest benefit: an individual-participant meta-analysis found an effect size of 0.42 (about a 5% increase) in maximal power, and another review found a small effect on peak power (SMD 0.25).[7][8][9][10]
Several meta-analyses of small crossover RCTs agree on a positive effect, but results are not uniform: peak power was not significantly improved in squat and bench press (SMD 0.204, p = 0.054). The evidence is consistent in direction but based on small studies. A 2025 meta-analysis in women found a comparable power effect (SMD 0.38) with no strength or sprint benefit.
Each plate is one paper. Taller = stronger study design, wider = more studies pooled. Tap one.
Nitrate gave small improvements in peak and mean power and faster time to peak power in short dynamic lower-body exercise, but had no clear effect on isometric maximal voluntary contraction.
Acute or chronic dietary nitrate significantly increases maximal muscle power, by about 5% on average. The effect was larger with an acute dose than with multi-day dosing.
In resistance-trained men, nitrate had a small benefit on reps to failure, mean power and mean velocity in squat and bench press, but not on peak power or peak velocity. Few studies with large variability.
In healthy women aged 18–30, acute nitrate gave a small-to-moderate improvement in power, but no significant effect on muscle strength or sprint performance.
A small benefit: pooled effects of SMD 0.31 for muscular endurance in two reviews and SMD 0.43 for repetitions to failure in squat/bench press.[9][11][12]
Three meta-analyses agree on a small effect, but they draw on limited, overlapping, mostly male studies with large variability (Tan 2023 pooled only six studies). That supports Grade B.
Each plate is one paper. Taller = stronger study design, wider = more studies pooled. Tap one.
Nitrate had a trivial but significant effect on muscular strength and a small significant effect on muscular endurance; the authors say more research is needed given the trivial-to-small effects.
In healthy men, beetroot supplements had a small effect on muscular endurance and lessened the strength drop when fatigued; strength measured at rest did not improve significantly.
In resistance-trained men, nitrate had a small benefit on reps to failure, mean power and mean velocity in squat and bench press, but not on peak power or peak velocity. Few studies with large variability.
Little to no benefit: no pooled effect in well-trained athletes (VO2max ≥65 mL/kg/min; d = 0.021) or in athletes generally (ES 0.04).[1][3][5]
Two meta-analyses found no significant effect in athletes, and an expert consensus agrees benefits diminish above a VO2peak of about 60 mL/kg/min. The consensus notes some individual responders may exist, so the evidence is null-to-weak rather than conclusively zero.
Each plate is one paper. Taller = stronger study design, wider = more studies pooled. Tap one.
Nitrate clearly improves exercise performance in recreationally active young healthy men, but the effect is objectively small. It was not seen in well-trained endurance athletes or in women-only studies.
Studies pooled
80
Overall effect
d = 0.174 (95% CI 0.120 to 0.229)
Well-trained endurance athletes (≥65 mL/kg/min, n = 26)
d = 0.021 (95% CI −0.103 to 0.144), not significant
Women-only studies (n = 6)
d = 0.116 (95% CI −0.126 to 0.358), not significant
Nitrate's effects seem diminished above a VO2peak of about 60 mL/kg/min. Experts recommend 8–16 mmol acutely or 4–16 mmol/day chronically, last dose 2–4 h pre-exercise, ideally from vegetables. Most statements lacked sufficient evidence.
Trivial at best: pooled strength effect SMD 0.08, no effect on isometric maximal contraction (SMD 0.03), and no significant effect when strength was tested rested.[8][11][12]
Meta-analyses find a trivial or null effect on maximal strength in the rested state; a benefit appears only for strength measured after fatigue. A tiny effect like this does not justify a Backed label.
Each plate is one paper. Taller = stronger study design, wider = more studies pooled. Tap one.
Nitrate had a trivial but significant effect on muscular strength and a small significant effect on muscular endurance; the authors say more research is needed given the trivial-to-small effects.
In healthy men, beetroot supplements had a small effect on muscular endurance and lessened the strength drop when fatigued; strength measured at rest did not improve significantly.
Nitrate gave small improvements in peak and mean power and faster time to peak power in short dynamic lower-body exercise, but had no clear effect on isometric maximal voluntary contraction.
Reps to failure, squat/benchSMD 0.43resistance-trained men, 6 studies[9]
Well-trained endurance athletesd = 0.021no effect at VO2max ≥65 mL/kg/min[1]
Beet products with ≥5 mmol per serving5 of 24lab analysis of products sold to athletes[16]
Evidence timeline— how the evidence built up
Meta-analysis or systematic reviewPosition standTrial or narrative review
Every paper cited on this page, placed by publication year. Hover a mark to preview it; select it to jump to the reference.
How it works
Inorganic nitrate is a natural compound in vegetables, especially leafy greens and beetroot, which typically contain over 250 mg (more than 4 mmol) per 100 g. About 80% of dietary nitrate comes from vegetables, and vegetable-rich eating patterns supply roughly 174 to 1222 mg a day. Supplements are usually concentrated beetroot juice "shots".
After you swallow nitrate, about a quarter is taken up into saliva, where bacteria on the tongue convert it to nitrite. Nitrite is absorbed and, where oxygen is low or the muscle is acidic, turned into nitric oxide. This lowers blood pressure, reduces the oxygen cost of moderate exercise and appears to help fast-twitch (type II) muscle fibres contract more efficiently. Killing mouth bacteria with strong antibacterial mouthwash blocks the nitrite step.[13][14][15]
References
Reviewed 03 Oct 2026 · every PubMed ID checked against PubMed
[1]Senefeld JW, et al. Ergogenic Effect of Nitrate Supplementation: A Systematic Review and Meta-analysis. Med Sci Sports Exerc. 2020;52(10):2250-2261. Meta-analysisPubMed · DOI
[2]McMahon NF, Leveritt MD, Pavey TG. The Effect of Dietary Nitrate Supplementation on Endurance Exercise Performance in Healthy Adults: A Systematic Review and Meta-Analysis. Sports Med. 2017;47(4):735-756. Meta-analysisPubMed · DOI
[3]Campos HO, et al. Nitrate supplementation improves physical performance specifically in non-athletes during prolonged open-ended tests: a systematic review and meta-analysis. Br J Nutr. 2018;119(6):636-657. Meta-analysisPubMed · DOI
[4]Gao C, et al. The effects of dietary nitrate supplementation on endurance exercise performance and cardiorespiratory measures in healthy adults: a systematic review and meta-analysis. J Int Soc Sports Nutr. 2021;18(1):55. Meta-analysisPubMed · DOI
[5]Shannon OM, et al. Dietary Inorganic Nitrate as an Ergogenic Aid: An Expert Consensus Derived via the Modified Delphi Technique. Sports Med. 2022;52(10):2537-2558. Position stand · industry tiesPubMed · DOI
[6]Maughan RJ, et al. IOC consensus statement: dietary supplements and the high-performance athlete. Br J Sports Med. 2018;52(7):439-455. Position standPubMed · DOI
[7]Coggan AR, et al. Effect of dietary nitrate on human muscle power: a systematic review and individual participant data meta-analysis. J Int Soc Sports Nutr. 2021;18(1):66. Meta-analysisPubMed · DOI
[8]Esen O, Dobbin N, Callaghan MJ. The Effect of Dietary Nitrate on the Contractile Properties of Human Skeletal Muscle: A Systematic Review and Meta-Analysis. J Am Nutr Assoc. 2023;42(4):327-338. Meta-analysisPubMed · DOI
[9]Tan R, et al. Effects of Dietary Nitrate Supplementation on Back Squat and Bench Press Performance: A Systematic Review and Meta-Analysis. Nutrients. 2023;15(11):2493. Meta-analysisPubMed · DOI
[10]Meng F, Liu Y, Qiu B, Li J. Does Nitrate Supplementation Improve Muscle Strength, Power, and Sprint Performance in Females? A Systematic Review and Meta-Analysis. Life (Basel). 2025;15(9):1425. Meta-analysisPubMed · DOI
[11]Alvares TS, et al. Effect of dietary nitrate ingestion on muscular performance: a systematic review and meta-analysis of randomized controlled trials. Crit Rev Food Sci Nutr. 2022;62(19):5284-5306. Meta-analysisPubMed · DOI
[12]Evangelista JF, et al. Effects of Beetroot-Based Supplements on Muscular Endurance and Strength in Healthy Male Individuals: A Systematic Review and Meta-Analysis. J Am Nutr Assoc. 2024;43(1):77-91. Meta-analysisPubMed · DOI
[13]Jones AM. Dietary nitrate supplementation and exercise performance. Sports Med. 2014;44 Suppl 1:S35-45. Review · industry tiesPubMed · DOI
[14]Govoni M, Jansson EA, Weitzberg E, Lundberg JO. The increase in plasma nitrite after a dietary nitrate load is markedly attenuated by an antibacterial mouthwash. Nitric Oxide. 2008;19(4):333-7. Randomized trialPubMed · DOI
[15]Wylie LJ, et al. Beetroot juice and exercise: pharmacodynamic and dose-response relationships. J Appl Physiol (1985). 2013;115(3):325-36. Randomized trialPubMed · DOI
[16]Gallardo EJ, Coggan AR. What's in Your Beet Juice? Nitrate and Nitrite Content of Beet Juice Products Marketed to Athletes. Int J Sport Nutr Exerc Metab. 2019;29(4):345-349. ReviewPubMed · DOI
[17]McDonagh STJ, et al. Influence of dietary nitrate food forms on nitrate metabolism and blood pressure in healthy normotensive adults. Nitric Oxide. 2018;72:66-74. Randomized trialPubMed · DOI
[18]Woessner M, et al. A stepwise reduction in plasma and salivary nitrite with increasing strengths of mouthwash following a dietary nitrate load. Nitric Oxide. 2016;54:1-7. Randomized trialPubMed · DOI
[19]McDonagh ST, et al. The Effects of Chronic Nitrate Supplementation and the Use of Strong and Weak Antibacterial Agents on Plasma Nitrite Concentration and Exercise Blood Pressure. Int J Sports Med. 2015;36(14):1177-85. Randomized trialPubMed · DOI
[20]Gilsanz L, et al. Effect of Caffeine and Nitrates Combination on Exercise Performance, Heart Rate and Oxygen Uptake: A Systematic Review and Meta-Analysis. Nutrients. 2024;16(19):3352. Meta-analysisPubMed · DOI
[21]Zart S, Fröhlich M. Ergogenic effects of supplement combinations on endurance performance: a systematic review and meta-analysis of randomized controlled trials. J Int Soc Sports Nutr. 2025;22(1):2524033. Meta-analysisPubMed · DOI
[22]Hord NG, Tang Y, Bryan NS. Food sources of nitrates and nitrites: the physiologic context for potential health benefits. Am J Clin Nutr. 2009;90(1):1-10. ReviewPubMed · DOI
Dose
8–16 mmol nitrate as a single (acute) dose, or 4–16 mmol per day chronically (expert consensus). Trials in the beetroot review used 316–985 mg nitrate per day.
4.2 mmol (70 ml concentrated juice)
No change in exercise responses versus placebo.[15]
~5 mmol
Appears to be the minimum dose needed to enhance performance in most people.[16]
8.4 mmol (140 ml)
Time to task failure +14%; expert-recommended acute range starts at 8 mmol.[5][15]
16.8 mmol (280 ml)
Time to task failure +12%: no extra benefit over 8.4 mmol, although oxygen cost fell further (−3.0%).[15]
4–16 mmol/day for several days
Expert-agreed chronic range; 2–6 days of loading consistently improved high-intensity constant-load exercise in earlier studies.[5][13]
Lab note
Timing. Plasma nitrite peaks about 2–3 hours after a dose, so take the final dose 2–4 hours before exercise. A single acute dose is ergogenic and gave a larger power effect than multi-day regimens in one analysis, but loading 4–16 mmol/day over several days is also effective.[5][7][13][15]
Which form?— hover or tap
Concentrated beetroot juice shotBest studied
Most trials used it; a 55 ml shot delivered ~5.76 mmol and raised plasma nitrite more than 456 ml of regular juice. Nitrate content varies widely between brands.[5][16][17]
Most trials used it; a 55 ml shot delivered ~5.76 mmol and raised plasma nitrite more than 456 ml of regular juice. Nitrate content varies widely between brands.[5][16][17]
Expert consensus: acute doses up to about 16 mmol are believed safe, but the safety of chronic supplementation needs more research. Vegetable-derived sources such as beetroot juice are preferred over nitrate salts.
Possible side effects
No adverse effects were agreed by the expert panel for nitrate-rich foods and juices; potential adverse effects of nitrate salts, gels, drinks or gum were unresolved
Talk to a doctor first if
You were planning to use sodium or potassium nitrate salts — the expert panel reached no consensus on their safety; prefer beetroot juice or vegetables
Lab note
Buy products certified by Informed Sport, Informed Choice or NSF Certified for Sport. Supplements can contain things that aren’t on the label.
Myths vs research— scroll through
Myth
More beetroot juice is always better
What the research says
16.8 mmol gave no more endurance benefit than 8.4 mmol.[15]
Myth
Any beet product will work
What the research says
Only 5 of 24 products tested consistently gave at least 5 mmol per serving; check the stated nitrate content.[16]
Myth
Nitrate helps elite endurance athletes most
What the research says
The benefit largely disappears in well-trained athletes (d = 0.021).[1][3]
Myth
Nitrate boosts maximal strength
What the research says
Effects on 1RM or maximal contraction are trivial or absent; benefits show up in power and reps.[8][11]
FAQ
Strong antibacterial (chlorhexidine) mouthwash blocks the conversion of nitrate to nitrite and blunts the blood-pressure effect; even weaker mouthwashes reduce it. Its effect on performance has not been tested directly in the studies we reviewed.[14][18][19]
Yes in principle: leafy greens and beetroot carry over 250 mg (4 mmol) per 100 g, and experts favour vegetable sources. Hitting a precise 8 mmol dose is easier with a labelled shot.[5][13]
2–4 hours before, matching the 2–3 hour peak in plasma nitrite.[5][15]
Experts consider acute doses up to about 16 mmol from vegetable sources safe; the safety of nitrate salts and long-term high intakes is less certain.[5][13]
A 2025 meta-analysis found a power benefit in women (SMD 0.38), but endurance effects in women-only studies were not significant.[1][10]
Time-trial performance, the most race-relevant endurance outcome, was not significantly improved in McMahon 2017 (ES −0.10) or Gao 2021, and Hoon 2013 (opened, not cited) found the same (ES 0.11, ns). The endurance benefit rests mainly on time-to-exhaustion tests.
The 'well-trained' cut-off differs between sources: ≥65 mL/kg/min (Senefeld 2020) vs >60 mL/kg/min (Shannon 2022 consensus). Shannon notes possible individual responders among highly trained athletes.
Women are under-represented: the pooled effect in women-only studies was not significant (Senefeld 2020, 6 studies), and Evangelista 2024 and Tan 2023 covered men only.
Shannon 2022: several panel members received free or discounted beetroot juice for research and one disclosed research funding from Gs Fresh Ltd. industry_funded is set true to flag these industry ties, not to imply the consensus itself was sponsored.
Alvares 2022 reports a significant but trivial strength effect (SMD 0.08) while Esen 2023 found no MVC effect; strength is graded C because the effect, if real, is trivial.
Gao 2021 included adults 'engaging in an endurance-based activity' of mixed training levels; its abstract does not split results by fitness level.
The safety side_effects field holds only what the opened sources state. Commonly cited effects such as red urine/stool were not verified in an opened source and are omitted.
WADA: dietary nitrate does not appear on the 2026 Prohibited List (searched a mirrored copy of WADA's 2026 list PDF), and the Delphi panel agreed nitrate use does not violate the spirit of sport.
Mouthwash evidence (Govoni 2008, Woessner 2016, McDonagh 2015) shows reduced plasma nitrite and blunted blood-pressure effects; none of the opened studies measured exercise performance, so the page should not claim mouthwash removes the performance benefit.
Gallardo 2019 and Hord 2009 are laboratory food analyses rather than reviews of trials; they are typed 'review' because the schema has no food-analysis type.
Jones 2014 appeared in a Gatorade Sports Science Institute-supported supplement, and the author attended a GSSI panel; industry_funded is true to flag this.
Zart 2025 found beetroot juice alone did not improve endurance in the 5 combination trials it pooled (SMD 0.02); this subset is small and does not change the B grade for recreationally active adults.
Meng 2025 did not report the number of studies or participants in its abstract; those fields are left null.
Nitrate content of the same beetroot product can vary by a mean 30% between batches (Gallardo 2019), so food_sources amounts are product-specific.
Where to buy— matched to the researched form and dose
Choose a concentrated beetroot juice shot that states its nitrate content (aim for 8-16 mmol, about 500-1,000 mg nitrate, 2-4 h before exercise); plain beetroot powders and 'nitric oxide' capsules that do not state nitrate mg do not qualify.
No product we can recommend yet
As of 3 Oct 2026 no amazon.in listing states its nitrate content. Beet It Sport's search hit (B0HD14KZM3) is actually an audiobook. Informed Sport-listed shots such as Beet It Sport Nitrate 400 aren't sold on amazon.in. Unived Elite Beet-420 (420 mg nitrate per shot, FSSAI 10722998000145) is sold only on unived.com.
Prices change; the price shown is the one seen on 2026-10-03. Third-party sellers on Amazon can change; check the seller and the certifier’s batch search before you buy. Proven Stack may earn a commission from these links in future. Picks are chosen for form, dose and third-party testing, never for payment.
