Creatine for Runners: Benefits, Risks and How to Take It

Creatine for runners may support strength, intervals and finishing speed – but does it improve endurance? Discover seven evidence-based benefits and risks.

Creatine for runners has moved from a niche idea to one of the most discussed trends in endurance nutrition. Once associated mainly with bodybuilders, powerlifters and sprinters, it is now appearing in the feeds, cupboards and training plans of distance runners too. That raises an obvious question: does creatine for runners actually improve endurance, or is it simply another supplement trend?

The short answer is that creatine is not a reliable shortcut to a faster 10K or marathon. Research does not show a consistent improvement in steady, continuous endurance performance. However, running is not always steady. Hills, intervals, surges, sprint finishes and gym sessions all demand rapid energy – and this is where creatine may be useful.

For some runners, the main benefit may not happen during the race itself. It may come from being able to complete slightly better-quality strength and high-intensity training, then turning those adaptations into more resilient running.

Here is what creatine does, where the evidence is strongest and how to decide whether it deserves a place in your training plan.

Creatine for runners: discover seven evidence-based benefits and risks, including its effects on endurance, strength, recovery, weight gain and safety.

WHAT IS CREATINE?

Creatine is a naturally occurring compound made from amino acids. Your body produces it, and you also obtain small amounts from foods such as meat and fish. Around 95% of the body’s creatine is stored in skeletal muscle, much of it as phosphocreatine.

Phosphocreatine helps regenerate adenosine triphosphate, better known as ATP. ATP is the immediate energy currency used by your muscles, but the amount available at any one time is limited. The phosphocreatine system helps replenish it rapidly during brief, demanding efforts.

That is why creatine is so well established in strength and power sports. It is particularly relevant when an athlete needs to produce repeated bursts of high-intensity work with short recovery periods.

Supplementing with creatine increases the amount stored in muscle. In practical terms, this may allow you to squeeze out another repetition in the gym, maintain power more effectively across hard intervals or recover your short-burst energy system more quickly between efforts. Over weeks of training, those small differences can support greater adaptations.

DOES CREATINE FOR RUNNERS IMPROVE ENDURANCE?

If by endurance you mean holding a steady aerobic effort for a long time, the evidence is mixed and generally unconvincing.

A 2023 review of creatine and endurance performance concluded that creatine is unlikely to meaningfully improve traditional endurance outcomes in every athlete. Any advantages appear more likely when an event includes surges, attacks, repeated accelerations or a finishing sprint – moments when the contribution from the phosphocreatine system increases.

A more recent systematic review in active adults also found that performance benefits were not universal across endurance studies. This matters because the phrase “improves exercise performance” can sound broader than the research supports. Creatine has strong evidence behind it, but its clearest effects are not the same as increasing your VO₂ max or making an easy pace feel effortless.

There is another trade-off for runners: body mass. Creatine draws water into muscle cells, so supplementation – particularly a loading phase – can increase scale weight. Even a relatively small increase could matter in a sport where you repeatedly move your body against gravity. A potential gain in high-intensity capacity may therefore be partly offset by a change in running economy, especially over long distances or on steep climbs.

The most honest verdict is this: creatine for runners may improve parts of performance, but it does not consistently improve pure aerobic endurance.

WHERE CREATINE MAY HELP

Although creatine is not an endurance supercharger, that does not make it irrelevant. A runner’s performance is built from more than one energy system.

1. Better-quality strength training

Strength work can improve running economy, force production and tissue capacity when it is programmed well. Creatine may help you perform more high-quality work during resistance training and, over time, support gains in strength and lean mass.

This is probably the clearest reason for an endurance runner to consider it. The goal is not to become bulky. It is to make your gym training more productive so that you can produce and absorb force more effectively when you run.

The International Society of Sports Nutrition position stand describes creatine monohydrate as an effective supplement for increasing high-intensity exercise capacity and training adaptations. Those are well-supported benefits, even if they are one step removed from marathon performance.

2. Hills, intervals and repeated surges

A hard hill repetition, a track interval and a late-race acceleration use more anaerobic energy than steady running. Creatine may help preserve power across repeated, demanding efforts, particularly when recovery between them is short.

That could be relevant to:

Middle-distance runners
Cross-country and fell runners
Trail and obstacle-course athletes
Runners completing regular interval or hill sessions
Anyone whose races involve frequent pace changes

It is less likely to transform a continuous, evenly paced long run.

3. A stronger finishing kick

Most of a distance race is aerobic, but the final move may not be. If two runners reach the closing stages together, the ability to surge or sprint can decide the result.

Creatine cannot compensate for inadequate endurance training, poor fuelling or pacing mistakes. However, by supporting repeated high-intensity work in training, it may help runners who need to develop their top-end speed and ability to change pace under fatigue.

4. Maintaining strength through a heavy training block

High-mileage weeks can make gym performance feel flat. Some research suggests creatine may help athletes tolerate demanding training and maintain muscular performance. That does not mean it prevents overtraining, and it should never be used to mask inadequate recovery or under-fuelling.

Think of it as a possible support for a well-built plan – not permission to keep adding load when your body is asking for rest.

CREATINE FOR FEMALE RUNNERS

Female athletes remain underrepresented in sports-nutrition research, so broad claims should be treated carefully. However, an ISSN position stand on the female athlete identifies creatine as one of the supplements with the strongest evidence for women and recommends 3–5 grams per day in relevant sporting contexts. This makes creatine for runners an important research area in female sport, even though direct running studies remain limited.

For female runners, its potential value is still most likely to come through strength, muscle function and high-intensity training rather than a direct boost to steady-state endurance. It may be particularly interesting during perimenopause and after menopause, when maintaining muscle and strength becomes an increasingly important part of performance and long-term health. That said, creatine is only one small part of the picture; adequate energy, protein, carbohydrate, sleep and progressive resistance training remain fundamental.

Research does not currently support changing the dose around menstrual-cycle phases. A consistent daily dose is the simpler, evidence-based approach.

Do vegetarian and vegan runners respond differently?

Creatine is found mainly in animal foods, so vegetarian and vegan athletes often begin with lower muscle creatine stores. Earlier research has shown that people following vegetarian diets may experience a greater increase in their stores after supplementation.

That does not guarantee a performance improvement, but it means plant-based runners may have more room to respond. Creatine monohydrate supplements are usually synthetically produced rather than extracted from animal tissue, although it is still sensible to check the product label and capsule ingredients.

WILL CREATINE MAKE YOU GAIN WEIGHT?

It can. Weight gain is the most consistently reported effect of creatine supplementation, especially when using a high-dose loading protocol.

The early increase is largely associated with water being stored inside muscle cells. It is not the same as gaining body fat. Longer-term changes may also reflect additional lean mass if creatine helps you train more effectively.

For some runners, this is not a problem. A stronger, more robust body may be a worthwhile trade. For an athlete targeting a hilly race, chasing marginal improvements in running economy or feeling anxious about rapid scale changes, it deserves more thought.

If you want to minimise a sudden shift, skip the loading phase and take a smaller daily dose. Start during a general or strength-focused training block rather than just before an important race, then assess how your body and running respond.

IS CREATINE SAFE?

Creatine monohydrate is one of the most extensively researched sports supplements. In healthy people taking recommended doses, the evidence is broadly reassuring. The ISSN review found no support for common claims that creatine causes dehydration, muscle cramps or kidney damage in healthy users.

Some people do experience bloating, nausea or diarrhoea, particularly when taking a large amount at once. A lower daily dose or splitting a loading dose across the day may help.

Creatine can also affect measurements involving creatinine, a breakdown product used in some kidney-function tests. If you have a blood test, tell your clinician that you take creatine so the result can be interpreted in context.

Speak to a doctor or registered sports dietitian before supplementing if you have kidney or liver disease, are pregnant or breastfeeding, take medication that may affect kidney function, are under 18, or have any relevant medical concern. Evidence in healthy adults should not be assumed to apply to every clinical situation.

HOW SHOULD RUNNERS TAKE CREATINE?

If you decide to try creatine for runners, keep it simple.

Choose creatine monohydrate

Creatine monohydrate is the form used in most research. More expensive varieties may make impressive claims about absorption or reduced water retention, but they have not consistently proved superior.

Take 3–5 grams daily

For most adults, 3–5 grams per day is the standard maintenance approach. Take it every day, including rest days. Consistency matters more than whether you have it before or after a run.

Loading is optional

A loading protocol saturates muscle stores more quickly. The commonly studied approach is approximately 0.3 grams per kilogram of body mass per day – usually split into several smaller servings – for five to seven days, followed by 3–5 grams daily.

You do not need to load. Taking 3–5 grams daily will increase stores more gradually over roughly three to four weeks and may reduce digestive discomfort and a sudden change in scale weight.

You do not need to cycle it

There is no established need to take scheduled breaks or “cycle off” creatine. If you stop, elevated muscle stores gradually return towards baseline.

Test it in training

Do not introduce it during race week. Give yourself several weeks to notice any changes in body mass, digestion, gym performance and the quality of hard running sessions. Keep the rest of your training relatively stable so you can judge whether it is helping.

Creatine claims: the quick verdict

Claim	Verdict
Creatine directly improves marathon endurance	Not consistently supported
Creatine can support strength-training adaptations	Strong evidence
Creatine may help repeated hills, intervals and surges	Plausible and supported by high-intensity evidence
Creatine increases VO₂ max	Not a reliable effect
Creatine causes fat gain	No – early weight gain is mainly water in muscle
Creatine causes dehydration and cramps	Not supported in healthy users
A loading phase is essential	No – loading only works faster
More expensive forms work better than monohydrate	Not convincingly demonstrated

WHO IS MOST LIKELY TO BENEFIT?

Creatine for runners may be worth considering if its strength and high-intensity benefits match your training. It could be a sensible option if you:

Complete two or more purposeful strength sessions each week
Train for middle-distance, cross-country, trail or obstacle events
Regularly perform hard hills, intervals or repeated sprints
Follow a vegetarian or vegan diet
Want to maintain muscle and strength as you get older
Are comfortable monitoring a possible increase in body mass

It may be lower priority if your training is almost entirely easy, continuous running; you are expecting an immediate aerobic boost; or the basics of fuelling, recovery and strength training are not yet in place.

No supplement will rescue low energy availability, inadequate carbohydrate intake, iron deficiency, poor sleep or an inconsistent training plan. Address those foundations first.

IS CREATINE BANNED IN SPORT?

Creatine itself is not on the World Anti-Doping Agency’s Prohibited List. However, supplements can be contaminated or mislabelled. Drug-tested athletes remain responsible for what enters their body.

Choose a product that has been independently batch tested. The Informed Sport programme tests every certified batch for prohibited substances, and athletes can check product and batch details online. Certification reduces risk; it cannot turn any supplement into a performance guarantee.

CREATINE FOR RUNNERS: FREQUENTLY ASKED QUESTIONS

Does creatine make you run faster?

Not automatically. It may help you perform better in strength sessions, repeated high-intensity intervals, surges or a sprint finish, but it does not consistently make steady endurance running faster.

Is creatine good for marathon runners?

It can be useful as a training aid, particularly during strength-focused blocks. There is no strong evidence that it directly improves marathon performance, and any benefit must be weighed against possible water-related weight gain.

When should runners take creatine?

Any convenient time is fine. Take 3–5 grams every day and focus on consistency. Having it with a meal may make it easier to remember and gentler on the stomach.

Should I take creatine before a run?

Creatine does not work like caffeine and will not provide an immediate pre-run boost. Its effects come from building and maintaining muscle stores over time.

What is the best creatine for runners?

Plain creatine monohydrate is the best-supported and usually the most economical option. Competitive athletes should choose an independently batch-tested product.

Do all runners need creatine?

No. It is optional. Carbohydrate availability, sufficient total energy, protein, hydration, sleep and a suitable training plan will have a much greater influence on endurance performance.

The Runner’s Journal verdict

So, does creatine for runners actually improve endurance? Not in the simple way the marketing might suggest. It does not reliably increase aerobic capacity or improve continuous endurance performance.

Its real value is more indirect. Creatine may help runners get more from strength training, maintain quality across hard repeated efforts and develop the power needed for hills, surges and fast finishes. For a runner who already has the essentials in place, that can make it a useful tool. For someone hoping to replace consistent training and adequate fuelling, it will be a disappointment.

If you choose to try it, use creatine monohydrate, take 3–5 grams daily, skip loading if you are concerned about a rapid change in body mass, and assess the results over several weeks. The question is not whether creatine “works” in general. It is whether its best-supported effects match the demands of your running.

Sources reviewed and further reading

This article is for general educational purposes and is not a substitute for individual medical or nutrition advice. If you have a medical condition, take medication or are unsure whether creatine is appropriate for you, speak to a qualified healthcare professional.