Caffeine for performance: dose, timing and cautions

An evidence-based guide to caffeine as a performance aid. Caffeine is one of the most-studied and best-evidenced legal ergogenic aids there is — but it is not equally useful for everyone, and for some sports it can quietly work against you. This covers how it works, the dose and timing that the research supports, what it actually helps, the large person-to-person variation, and the honest cautions: sleep, anxiety and gut upset, and the reason a precision athlete should think twice. Practical, non-hyped, and grounded in published consensus.

Here's the short version: caffeine has consistently been shown to improve performance at 3–6 mg per kilogram of body weight, most commonly taken about 60 minutes before you start^[1] — most useful for endurance and hard efforts, helpful but smaller for strength and power, and a poor bet for precision shooting, where the one good trial found it made scores worse. Everything below is the detail behind that sentence: the numbers, where they come from, why individuals differ so much, and how to decide whether it's for you at all.

A framing note before the numbers. Caffeine's performance effects are well studied, but people differ enormously — in how they metabolise it, how much they already use, and how their sport rewards alertness versus steadiness. So this is written as can, tends to and around, never as a guarantee, and every specific figure is a population-level guide drawn from published consensus, not a personal prescription. It's general education, not medical or dietary advice, and it isn't a personalised plan.

How caffeine actually works

Caffeine's main trick is that it blocks adenosine. Adenosine is a molecule that builds up in the brain as you use energy across the day and, by binding to its receptors, makes you feel drowsy and dampens arousal. Caffeine has a similar enough shape to slot into those receptors without activating them — so it sits in the way, blunting the "you're tired" signal. The position-stand summary of the mechanism is that caffeine acts on the central nervous system by antagonising adenosine receptors, which in turn increases neurotransmitter release, motor-unit firing rates and pain suppression.^[1] The practical upshot for exercise is that a task at a given intensity feels easier: pooling 21 studies, caffeine reduced ratings of perceived exertion during exercise by about 5.6%, and that drop in perceived effort statistically accounted for roughly 29% of the performance improvement.^[2] Caffeine is also ergogenic for cognitive function, including attention and vigilance, in most individuals.^[1]

That mechanism explains both its strengths and its risks in one go. Because it works largely by turning up arousal and turning down the feeling of effort, caffeine tends to help most where pushing through discomfort is the limiter — endurance, hard intervals, that last rep. And because it works by winding up the nervous system, the same dose can bring jitteriness, a faster heart rate, a shakier hand and a restless night. It's the same lever, pulled in a direction that helps some situations and hurts others.

How much — the 3–6 mg/kg dose

The headline number comes from the International Society of Sports Nutrition (ISSN, an international society headquartered in the United States) position stand on caffeine and exercise performance, which concludes that caffeine "has consistently been shown to improve exercise performance when consumed in doses of 3–6 mg/kg body mass."^[1] Because it is dosed per kilogram, the right amount scales with you: for a 70 kg athlete that's roughly 210–420 mg; for a 55 kg athlete, closer to 165–330 mg. As a rough anchor, the US Food and Drug Administration puts a 12 fl oz cup of regular brewed, non-speciality coffee at 113–247 mg of caffeine — so a performance dose is somewhere between about one and three cups, and which end depends heavily on the coffee.^[3]

That number is not one organisation's idiosyncrasy. The International Olympic Committee (international) consensus statement on dietary supplements gives the same 3–6 mg/kg of anhydrous caffeine taken about 60 minutes before exercise, and lists caffeine among the small handful of supplements — with creatine, nitrate and buffering agents — that have good evidence of performance benefit.^[4] The Australian Institute of Sport (Australia) likewise places caffeine in Group A of its Sports Supplement Framework, its top tier, defined as "strong scientific evidence for use in specific situations in sport using evidence-based protocols."^[5]

Two boundaries make the range make sense. At the bottom, the ISSN notes the minimal effective dose remains unclear but "may be as low as 2 mg/kg" — some people respond to surprisingly little. At the top, pushing higher does not buy more: very high doses such as 9 mg/kg "are associated with a high incidence of side-effects".^[1] More caffeine is not more performance; past a point it's just more jitter, more gut trouble and worse sleep. The sensible strategy is to start at the low end (say 2–3 mg/kg), see how you respond, and only nudge up if you tolerate it well.

When to take it

Caffeine takes time to reach the bloodstream and the brain. For ordinary sources — a capsule, coffee, or a pre-workout — the ISSN notes that the most commonly used timing is 60 minutes before exercise.^[1] That fits the pharmacology: caffeine appears in the blood within minutes, but peak plasma concentrations are reported anywhere from 30 to 120 minutes after an oral dose.^[1] The IOC consensus statement lands on the same ~60-minute figure.^[4] Take it too close to the start and it may not have kicked in yet.

The main exception is caffeine gum: much of the caffeine released by chewing is absorbed through the lining of the mouth, which is faster than swallowing a capsule, so it acts sooner and suits situations where you can't plan an hour ahead.^[1] Whichever route you use, the golden rule of race morning applies: rehearse the exact dose, source and timing in training first — the IOC's wording is that supplements intended to enhance performance "should be thoroughly trialled in training or simulated competition before being used in competition."^[4] Caffeine's effects — good and bad — are individual enough that competition day is the worst possible time to discover how yours land.

What it helps — and by how much

Caffeine is not a blanket "get stronger and faster" pill; the size of the benefit depends on the type of exercise. Reading the ISSN position stand, a rough hierarchy emerges:

• Aerobic endurance — the biggest, most reliable win. The position stand describes aerobic endurance as "the form of exercise with the most consistent moderate-to-large benefits from caffeine use," while noting that the magnitude differs between individuals.^[1] Cycling, running and other sustained efforts are where caffeine most dependably helps.
• High-intensity and repeated efforts — helpful. The IOC consensus statement lists short-duration supramaximal work and repeated-sprint tasks alongside endurance among the activities caffeine benefits.^[4] Part of the reason is that caffeine reduces how hard the effort feels — about a 5.6% drop in perceived exertion across pooled trials.^[2]
• Strength and power — real but smaller. Caffeine tends to improve muscular strength, power and muscular endurance too, but the position stand reports small effect sizes: roughly 2–7% for muscular strength, 2–4% for jumping, and 6–7% for muscular endurance.^[1] Worth having, but don't expect it to transform a one-rep max.
• Focus, alertness and vigilance — consistent. Beyond the muscles, caffeine is "ergogenic for cognitive function, including attention and vigilance, in most individuals" — useful in fatigue, long events, and early-morning or sleep-deprived sessions.^[1]

Individual variation and habituation

If one message matters most, it's this: caffeine's effect varies a lot between people, and the averages above hide big spreads. Part of that is genetic. The liver enzyme that clears caffeine is coded by the CYP1A2 gene, and "fast" versus "slow" metabolisers can respond very differently. In a placebo-controlled trial of 101 competitive male athletes riding a 10 km time trial, those with the fast (AA) genotype went 4.8% quicker at 2 mg/kg and 6.8% quicker at 4 mg/kg; those with the AC genotype showed no effect at all; and those with the slow (CC) genotype were 13.7% slower at 4 mg/kg than on placebo — a substantial impairment, not a small one.^[6] A second gene, ADORA2A (an adenosine-receptor gene), is linked to how much anxiety a given dose provokes: in 94 infrequent users given 150 mg, particular ADORA2A genotypes reported significantly bigger increases in anxiety than the others.^[7] You can't easily read your own genotype off a label, but you can read your own response — which is exactly why self-testing matters more than any population average.

Then there's habituation. Tolerance develops to many of caffeine's pharmacological effects,^[8] and heavy daily users often report feeling less of a subjective lift. Whether that blunts the performance benefit is a different question, and the ISSN's answer is that "there does not appear to be a consistent difference in the performance effects of acute caffeine ingestion between habitual and non-habitual caffeine users" — so a pre-exercise dose can still help even if you drink coffee every day.^[1] Some athletes cut back for a few days before a big event to sharpen the response; we have not found consistent evidence that this works, so treat it as an experiment rather than a rule.

The cautions — sleep, anxiety, gut

Because caffeine works by revving the nervous system, its downsides are the flip side of its benefits, and they are worth taking seriously:

• Sleep. This is the most underrated cost. Caffeine "prolongs time to fall asleep, decreases the deep stages of non-rapid-eye movement (nonREM) sleep, reduces sleep efficiency."^[1] And it lingers: the ISSN reports an average half-life of 4–6 hours that can range from 1.5 to 10 hours between individuals,^[1] and EFSA's figure is about four hours with a two-to-eight-hour range^[9] — so an afternoon dose can still be circulating at bedtime. EFSA also notes that single doses as small as 100 mg may affect sleep duration and patterns in some adults, particularly close to bedtime.^[9] Since sleep is where training adaptation and recovery happen, caffeine that wrecks your sleep can cost more than it gains — favour earlier in the day.
• Anxiety and jitters. Caffeine's short-term adverse effects include interrupted sleep and anxiety.^[9] Sensitivity varies, and some of that variation is genetic — the ADORA2A finding above came from a dose of just 150 mg.^[7] For anyone prone to anxiety, or in a sport where a calm nervous system helps, this can be a net negative rather than a boost.
• Gut. Caffeinated coffee stimulates colonic motor activity — in one manometry study its effect was similar in magnitude to a 1,000 kcal meal, 60% stronger than water and 23% stronger than decaffeinated coffee.^[10] Mid-race, that is the last thing you want. Another reason to rehearse it in training rather than debut it on the day.
• Blood pressure. Pooling randomised trials of at least a week's caffeine or coffee intake, blood pressure rose by about 2.0 mmHg systolic and 0.7 mmHg diastolic overall, and more for caffeine on its own (about 4.2 and 2.4 mmHg); effects on heart rate were negligible.^[11] In most healthy people that is minor, but it is a real reason for anyone with uncontrolled hypertension to be cautious. At high intakes, caffeine's cardiovascular effects can extend from moderate rises in heart rate to cardiac arrhythmia, which is why a heart-rhythm condition warrants a conversation with a doctor.^[8]

Precision sports — where caffeine can backfire

Here's the caution most performance articles skip. The very stimulation that helps an endurance athlete can hurt a precision athlete. Caffeine measurably increases physiological tremor: in a controlled study of young non-smoking men, 3 mg/kg raised whole-arm physiological tremor, where 1 mg/kg did not.^[12] A still hand is precisely what archery, target shooting, darts and the putting stroke in golf are built on.

Be careful with the balance half of this claim, though, because it is weaker than it is usually told. A systematic review of nine placebo-controlled trials of caffeine and standing balance found that younger participants' balance was generally unaffected; the significant impairments appeared in studies of older participants, averaging over 65.^[13] So "caffeine makes everyone sway" is not what the balance literature shows.

The direct sporting evidence comes from shooting, and it is not encouraging. In a randomised, double-blind, placebo-controlled crossover trial of 20 trained rifle shooters (30 prone and 30 standing shots at 50 m), a 300 mg dose of caffeine reduced total score by 11.8 points — with essentially all of the damage in the standing position (an 11.3-point drop) and none prone (0.6 points). The authors proposed increased postural sway as the explanation and explicitly ruled out a faster heart rate, because heart rate did not rise.^[14] A separate randomised, double-blind, placebo-controlled trial in seven elite male double-trap clay-target shooters, each completing three trials (2 mg/kg, 4 mg/kg and placebo), found no benefit to shooting accuracy, reaction time or target-tracking time.^[15] Seven athletes is a very small sample, so read that one as "no benefit was detected here", not as proof of no effect. The takeaway isn't that caffeine is banned for these athletes — it's that in the two shooting trials we could find, caffeine was not shown to help and was once shown to hurt. That is a poor bet to take into a competition.

Safe limits and who should be careful

Two independent regulators land on the same number. The US Food and Drug Administration (United States) cites 400 mg of caffeine a day — about two to three 12-fluid-ounce cups of coffee — as an amount "not generally associated with negative effects" for most adults.^[3] The European Food Safety Authority (European Union) reached the same conclusion for healthy adults in the general population, and adds a single-dose figure: intakes of up to 200 mg at once (about 3 mg/kg for a 70 kg adult) do not raise safety concerns, including when taken less than two hours before intense exercise.^[9] That single-dose figure is worth pausing on, because a 3–6 mg/kg performance dose for a 70 kg athlete (210–420 mg) sits at or above it — the sports-nutrition dose and the food-safety single-dose reference point are not the same number. Both are daily-total or per-dose figures that are easy to overshoot when a performance dose sits on top of your normal coffee, tea, cola, energy drinks and pre-workout.

Some people should keep caffeine well below that, or avoid it around exercise entirely:

• Pregnancy and breastfeeding. EFSA (European Union) concludes that caffeine from all sources up to 200 mg a day does not raise safety concerns for the foetus,^[9] and the NHS (United Kingdom) advises the same limit in pregnancy, noting that too much caffeine has been linked to a higher chance of miscarriage and stillbirth.^[16]
• Heart-rhythm problems or uncontrolled high blood pressure. Regular caffeine raises blood pressure by a few mmHg,^[11] and at high intakes its cardiovascular effects can reach arrhythmia.^[8] Check with a doctor first.
• Anxiety, panic or sleep disorders. Anxiety and interrupted sleep are among caffeine's recognised short-term adverse effects,^[9] and the sleep cost can quietly undermine the training it's meant to support.^[1]
• Certain medications. Caffeine is cleared by the liver enzyme CYP1A2, and a number of drugs — including some SSRIs (notably fluvoxamine), certain antiarrhythmics, antipsychotics, bronchodilators and quinolone antibiotics — are potent inhibitors of it, so caffeine can accumulate further than expected.^[8] A quick check with a pharmacist is worthwhile if you take regular medication. (Reflux is often listed here too. A meta-analysis of 15 case-control studies found no significant association overall between coffee intake and gastro-oesophageal reflux disease, with an odds ratio of 1.06, 95% CI 0.94–1.19. But when those studies were split by how reflux was defined, the ones diagnosing it by endoscopy rather than by symptoms alone did show a significantly higher odds ratio. So the picture is genuinely mixed: treat coffee as a personal trigger worth testing, rather than as either a general rule or a settled non-issue.^[17])
• Children and adolescents. The safe limits above are for adults. EFSA proposes a much lower 3 mg/kg of body weight a day for children and adolescents,^[9] and the FDA points to the American Academy of Pediatrics (United States) advising against energy drinks for children and teens.^[3]

A final honest note: energy drinks and pre-workouts often stack caffeine with other stimulants and large, poorly labelled doses. If you use caffeine for performance, the cleanest approach is a known, measured amount from a simple source, kept within your daily total — not a mystery scoop.

Common questions

How much caffeine improves performance, and when should I take it?

The International Society of Sports Nutrition position stand says caffeine has consistently been shown to improve exercise performance at 3–6 mg per kilogram of body weight — for a 70 kg person, roughly 210–420 mg. The most commonly used timing is about 60 minutes before exercise, and peak blood levels arrive somewhere between about 30 and 120 minutes after a dose; caffeine released from chewing gum is absorbed through the lining of the mouth, which is faster.^[1] The International Olympic Committee's consensus statement gives the same 3–6 mg/kg taken about 60 minutes before.^[4] Very high doses such as 9 mg/kg carry a high incidence of side effects, while the minimal effective dose may be as low as 2 mg/kg.^[1] Test your dose and timing in training, never for the first time in competition.^[4]

Does caffeine help with strength and power, or just endurance?

Aerobic endurance shows the most consistent, moderate-to-large benefit from caffeine. Strength, power and muscular endurance also tend to improve, but the effect sizes the position stand reports are small: roughly 2–7% for muscular strength, 2–4% for jumping and 6–7% for muscular endurance.^[1] High-intensity and repeated-sprint work often benefits partly because caffeine lowers how hard the effort feels — pooled trials show ratings of perceived exertion falling by about 5.6% during exercise.^[2] So it helps across the board, but expect a bigger, more reliable lift for endurance than for one-rep strength.

Can caffeine hurt performance in precision sports like archery, shooting or golf?

It can. At a performance-sized dose caffeine measurably increases physiological tremor — 3 mg/kg raised whole-arm tremor in young men, where 1 mg/kg did not^[12] — and steadiness is what precision sports are built on. In a randomised, placebo-controlled study of trained rifle shooters, 300 mg of caffeine cut total score by about 11.8 points, almost all of it in the standing position (an 11.3-point drop); the authors proposed increased postural sway as the explanation and ruled out a rise in heart rate.^[14] A randomised, double-blind, placebo-controlled trial in seven elite male double-trap clay-target shooters found 2 and 4 mg/kg gave no benefit to accuracy, reaction time or target-tracking time — though with only seven athletes that is a weak absence of effect rather than proof.^[15] Balance evidence is more mixed: a systematic review of placebo-controlled trials found standing balance was generally unaffected in younger adults, with impairment mainly in people over about 65.^[13] The fair read is that in precision shooting caffeine has not been shown to help and has been shown to hurt — test it carefully before relying on it.

Does caffeine still work if I drink coffee every day?

Probably, at least somewhat. Tolerance develops to many of caffeine's pharmacological effects,^[8] and heavy users may feel less of a subjective lift. But the position stand found no consistent difference in the performance effects of acute caffeine between habitual and non-habitual users, so a pre-exercise dose can still help even if you drink coffee daily.^[1] Some athletes deload their caffeine for a few days beforehand to sharpen the effect; we have not found consistent evidence that this works. What is clear is that individual response varies a lot, partly for genetic reasons — in one trial, fast metabolisers rode 4.8–6.8% quicker while slow metabolisers rode 13.7% slower at 4 mg/kg^[6] — so your own experience matters more than any average.

How much caffeine is safe, and who should limit it?

The US Food and Drug Administration cites 400 mg of caffeine a day — about two to three 12-fluid-ounce cups of coffee — as an amount not generally associated with negative effects for most adults,^[3] and the European Food Safety Authority reaches the same 400 mg a day for healthy adults, plus 200 mg for a single dose.^[9] In pregnancy, both EFSA and the UK's NHS advise no more than about 200 mg a day.^[9][16] Caffeine is best kept low or avoided if you have anxiety, a heart-rhythm condition or uncontrolled high blood pressure, and it can interact with medicines cleared by the same liver enzyme, CYP1A2.^[8] It also prolongs the time to fall asleep and reduces sleep efficiency, so afternoon and evening caffeine is a common hidden cost.^[1] If in doubt, check with a doctor or pharmacist.

Takeaways

• The dose is 3–6 mg/kg. Roughly 210–420 mg for a 70 kg athlete; start at the low end, and note that ~2 mg/kg may be enough while ~9 mg/kg carries a high incidence of side effects.^[1]
• Take it about 60 minutes before. That is the most commonly used timing, and peak blood levels land roughly 30–120 minutes after a dose;^[1] gum absorbs faster through the mouth. The IOC gives the same 3–6 mg/kg at ~60 minutes.^[4]
• Endurance benefits most. Aerobic work shows the most consistent, moderate-to-large gains; strength (~2–7%), jumping (~2–4%) and muscular endurance (~6–7%) benefit by less.^[1]
• Expect big individual variation. In one trial fast CYP1A2 metabolisers rode up to 6.8% quicker while slow metabolisers rode 13.7% slower at the same 4 mg/kg;^[6] ADORA2A variants track caffeine-induced anxiety.^[7] Self-test in training.
• Mind the cautions. Delayed sleep onset and reduced sleep efficiency, with a 4–6 hour average half-life that can stretch to 10;^[1] anxiety;^[9] and a real colonic-motility effect.^[10] Keep caffeine earlier in the day.
• Precision shooting, think twice. 300 mg cut trained rifle shooters' scores by 11.8 points, all of it standing;^[14] 2–4 mg/kg gave no benefit in a seven-athlete trial of elite double-trap clay-target shooters.^[15] A performance dose also raises hand tremor.^[12]
• Stay within safe limits. The FDA (US) and EFSA (EU) both cite 400 mg/day for adults, EFSA adding 200 mg per single dose;^[3][9] ~200 mg/day in pregnancy per EFSA and the NHS (UK).^[9][16]
• It's a tool, not a requirement. Good training, fuelling, sleep and recovery matter far more; caffeine is a small, optional edge for those it suits.

If you remember one thing, make it that caffeine is a situational aid, not a universal one: a genuine edge for endurance and hard efforts in people who tolerate it, a smaller boost for strength and focus, and a potential liability for the steady-handed sports. Know your dose, respect the cautions, and test it on yourself before it ever matters — that's how you get the upside without paying for it in lost sleep or a shaky aim.

References

Numbered sources for the specific figures above. Where a claim reflects agreed guidance rather than a single trial, the citation is to the position stand, consensus statement or regulator concerned, with its country or international remit named — deliberately drawn from more than one country, because no single nation's guidance is universal.

1. Guest NS, VanDusseldorp TA, Nelson MT, Grgic J, Schoenfeld BJ, Jenkins NDM, Arent SM, Antonio J, Stout JR, Trexler ET, Smith-Ryan AE, Goldstein ER, Kalman DS, Campbell BI. International society of sports nutrition position stand: caffeine and exercise performance. Journal of the International Society of Sports Nutrition. 2021;18(1):1. (International Society of Sports Nutrition — an international society headquartered in the United States.) PMC7777221
2. Doherty M, Smith PM. Effects of caffeine ingestion on rating of perceived exertion during and after exercise: a meta-analysis. Scandinavian Journal of Medicine & Science in Sports. 2005;15(2):69–78. PubMed 15773860
3. US Food and Drug Administration (United States). Spilling the Beans: How Much Caffeine is Too Much? FDA Consumer Updates. fda.gov
4. Maughan RJ, Burke LM, Dvorak J, Larson-Meyer DE, Peeling P, Phillips SM, Rawson ES, Walsh NP, Garthe I, Geyer H, Meeusen R, van Loon LJC, Shirreffs SM, Spriet LL, Stuart M, Vernec A, Currell K, Ali VM, Budgett RG, Ljungqvist A, Mountjoy M, Pitsiladis YP, Soligard T, Erdener U, Engebretsen L. IOC consensus statement: dietary supplements and the high-performance athlete. British Journal of Sports Medicine. 2018;52(7):439–455. (International Olympic Committee — international.) PMC5867441
5. Australian Institute of Sport (Australia). AIS Sports Supplement Framework — Group A. Australian Sports Commission. ais.gov.au
6. Guest N, Corey P, Vescovi J, El-Sohemy A. Caffeine, CYP1A2 genotype, and endurance performance in athletes. Medicine & Science in Sports & Exercise. 2018;50(8):1570–1578. PubMed 29509641
7. Alsene K, Deckert J, Sand P, de Wit H. Association between A2a receptor gene polymorphisms and caffeine-induced anxiety. Neuropsychopharmacology. 2003;28(9):1694–1702. PubMed 12825092
8. Carrillo JA, Benitez J. Clinically significant pharmacokinetic interactions between dietary caffeine and medications. Clinical Pharmacokinetics. 2000;39(2):127–153. PubMed 10976659
9. European Food Safety Authority (European Union). Caffeine — EFSA explains risk assessment, 2015, summarising the conclusions of the EFSA Panel on Dietetic Products, Nutrition and Allergies (NDA), Scientific Opinion on the safety of caffeine, EFSA Journal 2015;13(5):4102. efsa.europa.eu (PDF)
10. Rao SS, Welcher K, Zimmerman B, Stumbo P. Is coffee a colonic stimulant? European Journal of Gastroenterology & Hepatology. 1998;10(2):113–118. PubMed 9581985
11. Noordzij M, Uiterwaal CSPM, Arends LR, Kok FJ, Grobbee DE, Geleijnse JM. Blood pressure response to chronic intake of coffee and caffeine: a meta-analysis of randomized controlled trials. Journal of Hypertension. 2005;23(5):921–928. PubMed 15834273
12. Miller LS, Lombardo TW, Fowler SC. Caffeine, but not time of day, increases whole-arm physiological tremor in non-smoking moderate users. Clinical and Experimental Pharmacology and Physiology. 1998;25(2):131–133. PubMed 9493502
13. Briggs I, Chidley JB, Chidley C, Osler CJ. Effects of caffeine ingestion on human standing balance: a systematic review of placebo-controlled trials. Nutrients. 2021;13(10):3527. PMC8538128
14. Nygaard H, Riksaasen S, Hjelmevoll LM, Wold E. Effect of caffeine ingestion on competitive rifle shooting performance. PLOS ONE. 2019;14(10):e0224596. PMC6822722
15. Share B, Sanders N, Kemp J. Caffeine and performance in clay target shooting. Journal of Sports Sciences. 2009;27(6):661–666. PubMed 19308789
16. National Health Service (United Kingdom). Foods to avoid in pregnancy. NHS. nhs.uk
17. Kim J, Oh SW, Myung SK, Kwon H, Lee C, Yun JM, Lee HK; Korean Meta-analysis (KORMA) Study Group. Association between coffee intake and gastroesophageal reflux disease: a meta-analysis. Diseases of the Esophagus. 2014;27(4):311–317. PubMed 23795898

This is general educational information, not medical, dietary or coaching advice. Every figure here is referenced above — to position stands and consensus statements (ISSN, IOC, AIS), to food-safety and public-health bodies in more than one country (FDA, EFSA, NHS), and to individual peer-reviewed trials — and all are framed as population-level guides. Individual response to caffeine varies widely with genetics, habitual intake, body size, health and medication. Anyone who is pregnant or breastfeeding, or who has a heart condition, high blood pressure, an anxiety or sleep disorder, or takes regular medication, should consult a doctor or pharmacist before using caffeine as a performance aid. Caffeine is not appropriate as a performance aid for children or adolescents. See our Terms for more.

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