Creatine for runners: does it help endurance performance?

If you have spent any time in a gym, you already know creatine has a nearly spotless reputation. Hundreds of trials and several decades of use point in the same direction. Kreider et al. (2017), in the International Society of Sports Nutrition position stand, concluded that creatine monohydrate is the most effective ergogenic nutritional supplement available for increasing high intensity exercise capacity and lean body mass during training. That is a strong statement, and it is well earned.

But runners are not powerlifters. The questions that matter for us are different. Does creatine make you faster over 10 kilometres or a marathon? Will it slow you down by adding weight? And if the headline benefit is power, why would a distance runner bother? This article works through the honest answer. The direct endurance case is weak, but the indirect case is genuinely worth your attention.

What creatine actually does in muscle

Creatine is stored in muscle as phosphocreatine, a fast access reserve for regenerating ATP, the immediate energy currency for muscular contraction. Supplementing with creatine raises those phosphocreatine stores, which lets you resynthesise ATP faster during short, intense efforts and buffer the hydrogen ions that accumulate when you push hard. Forbes et al. (2023) describe this mechanism clearly: more phosphocreatine means a greater capacity to rapidly resynthesise ATP during the surges and sprints that decide many races.

That mechanism explains why creatine shines for anything explosive and why it does very little for a long, even paced aerobic effort. Cooper et al. (2012) summarised it neatly in their review: the effects of creatine diminish as the duration of exercise increases. A single 100 metre kick is right in its wheelhouse. A flat three hour marathon is not.

The honest part: creatine will not raise your VO₂max

Let us deal with the disappointment up front. Creatine does not improve your maximal oxygen uptake, and it does not enhance the core adaptations to aerobic training. Reardon et al. (2006) put this to a controlled test, supplementing healthy active people through four weeks of endurance training. Training improved fuel use and muscle glycogen in everyone, but creatine produced no additional metabolic benefit. The conclusion was blunt: creatine does not affect the metabolic adaptations to endurance training.

So if you are looking for a pill that builds a bigger aerobic engine, this is not it. The engine is built by your training, particularly the low intensity volume that drives mitochondrial and cardiovascular adaptation. Creatine sits outside that pathway entirely. Understanding that boundary is what stops creatine from being oversold to runners.

Where creatine helps runners indirectly

Here is the more interesting story. Creatine does not improve endurance directly, but it supports several things that, in turn, make you a better runner. Think of it as a training amplifier rather than a performance pill.

It supports the strength work that improves running economy. Heavy strength training is one of the few interventions reliably shown to improve running economy, the amount of oxygen you burn at a given pace. Eihara et al. (2022) found in a meta analysis that heavy resistance training, especially with near maximal loads, improved running economy and time trial performance more than plyometric work. Creatine is the best supported aid for exactly that kind of training. Lanhers et al. (2015) confirmed in a meta analysis that creatine improves lower limb strength, and Branch (2003) found small but consistent gains in strength and lean mass across the literature. Better strength sessions feed directly into a more economical stride. If you are new to lifting, our guide to strength training for runners is the place to start.

It sharpens the finishing kick and repeated sprints. The moments creatine is built for, fast surges, hill repeats, and the sprint to the line, are precisely the moments that decide close races and hard intervals. Wax et al. (2021) note in their review that creatine consistently improves single and repeated bouts of short, high intensity effort. If your event has a finishing straight or your interval session lives or dies on the last rep, that is real value.

It helps with glycogen storage and recovery. This is the most endurance relevant benefit. Roberts et al. (2016) showed that when creatine is taken with carbohydrate, it augments muscle glycogen storage during the first 24 hours of recovery after exhausting exercise. Forbes et al. (2023) highlight the effect of taking the two together as a plausible route by which creatine could support high intensity aerobic work, since glycogen is the dominant fuel for it. It pairs naturally with smart fuelling, which we cover in our guide to carb loading for a marathon. Add the recovery angle, Wax et al. (2021) note creatine can help mitigate recovery time between sessions, and you have a supplement that helps you absorb a harder training load even if it never touches your VO₂max.

How to dose creatine as a runner

The practical protocol is refreshingly simple, and the safety record is strong. Kreider et al. (2017) found no evidence that recommended doses cause harm in healthy people, including no support for the long standing kidney and cramping myths.

There is no need to cycle on and off. If you are managing protein intake around your training, creatine slots in easily; our guide to protein for runners covers how the two fit together in a recovery routine.

So, should a runner take creatine?

The honest answer depends on what you do besides running. If your training already includes regular strength work, hard intervals, or sprint finishes, creatine is a cheap, well evidenced way to get more out of those sessions and recover faster between them. If you are a pure long slow distance runner chasing aerobic capacity and nothing else, the benefits are marginal and the small weight gain may not be worth it.

Set your expectations correctly and you will not be disappointed. Creatine is not an endurance supplement in the way carbohydrate or iron status is. It is a strength, power, and recovery supplement that happens to help runners who train like athletes rather than just logging miles.

Frequently asked questions

Related reading: strength training for runners: the evidence based case for lifting.