Creatine Isn’t Just for Your Muscles: What the Research Says About Your Brain

For decades, creatine has been treated like the unofficial dietary supplement of dudes who own stringer tank tops.

Take creatine. Lift heavy things. Get bigger.

Simple enough.

Except your muscles aren't the only tissue in your body that needs a metric shitload of energy.

Your brain does too.

And a growing body of research suggests that creatine may play a role in cognitive performance, mental fatigue, sleep deprivation, and potentially even recovery following traumatic brain injury.

So if you've spent the last twenty years thinking creatine exists exclusively to help you squeeze out another rep on bench press, congratulations.

There's more going on upstairs.

What Does Creatine Actually Do?

Creatine helps your body rapidly regenerate adenosine triphosphate, better known as ATP.

ATP is essentially cellular currency. When your cells need energy immediately, they spend ATP.

Your muscles use a lot of it.

Your brain also happens to be an extraordinarily energy-hungry organ.

Creatine is stored as phosphocreatine, which can donate a phosphate group to ADP to rapidly regenerate ATP when energy demand increases.

This is one reason researchers have become increasingly interested in creatine supplementation for something beyond bigger quads:

Keeping the brain supplied with energy when things start getting ugly.

And "ugly" can mean sleep deprivation, prolonged cognitive work, intense physical activity, hypoxia, or potentially the metabolic disruption associated with traumatic brain injury.

Creatine and Mental Performance Under Fatigue

Here's where things get interesting.

Being awake for 20-plus hours is not exactly conducive to brilliant decision-making.

Anyone who has worked overnight, operated on minimal sleep, pulled security at 0300, had a newborn, or tried to navigate an airport after an overnight flight already understands this without a randomized controlled trial.

Researchers have started looking at whether creatine can help.

Creatine During Sleep Deprivation

A 2024 study published in Scientific Reports examined creatine supplementation during approximately 21 hours of sleep deprivation.

Researchers didn't just give people creatine and ask whether they "felt sharper." They used magnetic resonance spectroscopy to examine changes in brain energy metabolism.

A large single dose of creatine affected cerebral high-energy phosphate metabolism and was associated with improvements in cognitive performance and processing speed during sleep deprivation.

In other words, when the brain was being metabolically kicked in the teeth by lack of sleep, additional creatine appeared to help.

That does not mean you should replace sleep with creatine.

Nice try.

Sleep remains undefeated.

Creatine After 24 Hours Without Sleep

This isn't the first time researchers have found something similar.

A 2006 study published in Psychopharmacology examined participants taking 20 grams of creatine per day for seven days before undergoing sleep deprivation combined with intermittent exercise.

Creatine supplementation reduced deterioration in several measures after 24 hours without sleep, including choice reaction time and some psychomotor measures.

That's particularly interesting for people whose jobs require physical performance and decision-making while fatigued.

Military personnel.

Law enforcement.

Firefighters.

EMS.

Shift workers.

And parents attempting to assemble IKEA furniture after putting three children to bed.

What Happens at 36 Hours?

Researchers pushed things further in another study examining cognitive performance after 36 hours of sleep deprivation.

Creatine supplementation was associated with better performance on a complex executive-function task compared with placebo.

Interestingly, the effect wasn't equally apparent across simpler cognitive tasks.

That gives us a potentially important clue.

Creatine may not turn a rested person into Bradley Cooper from Limitless.

Its cognitive effects may become more relevant when energy demands increase and the brain is operating under stress.

Creatine and Mental Fatigue

Sleep deprivation isn't the only place researchers have found interesting results.

A double-blind, placebo-controlled study published in Neuroscience Research examined creatine supplementation during repeated mathematical calculations.

Participants taking creatine reported reduced mental fatigue during the repeated cognitive workload.

Yes.

Scientists basically made people do math until their brains hurt.

For science.

But the finding matters.

The potential cognitive benefits of creatine may not simply involve "intelligence." They may involve maintaining performance as cognitive demand accumulates.

That's a considerably more useful distinction for tactical athletes and people working in high-stress environments.

Creatine and Traumatic Brain Injury

Now we get into the genuinely interesting territory.

Following a traumatic brain injury, the brain can experience major disruptions in cellular energy metabolism.

This phenomenon is sometimes described as an energy crisis following TBI.

The brain needs energy to restore ionic balance, maintain cellular processes, repair damage, and generally deal with the fact that somebody just rang its doorbell with a baseball bat.

Because the creatine-phosphocreatine system helps buffer cellular energy availability, researchers have investigated whether increasing creatine availability could potentially help the injured brain.

There is biological rationale.

There is animal research.

And there is some human research.

But this is also where we need to pump the brakes before Instagram turns creatine into "THE SUPPLEMENT DOCTORS DON'T WANT YOU TO KNOW ABOUT FOR CONCUSSIONS."

Human Research on Creatine and TBI

One of the most frequently cited human studies involved children and adolescents with traumatic brain injuries.

Researchers administered creatine at 0.4 grams per kilogram of bodyweight per day for six months.

The creatine group showed improvements across several measures associated with recovery, including cognitive function, communication, locomotion, post-traumatic amnesia, and disability.

A subsequent paper from the same research group reported improvements in common post-TBI symptoms including headache, dizziness, and fatigue.

Those findings are promising.

They're also not the final word.

The studies were small, involved pediatric patients, and weren't the kind of large, blinded, multicenter randomized trials we'd want before declaring creatine a standard treatment for traumatic brain injury.

Translation:

Interesting as hell. Not medical gospel.

Could Creatine Help With Concussions?

Maybe.

That's the scientifically responsible answer.

Reviews examining creatine and mild traumatic brain injury have identified several mechanisms through which creatine could theoretically provide neuroprotection or support recovery.

But there simply isn't enough high-quality adult human research yet to say that taking creatine prevents or treats concussions.

That's an important distinction.

The evidence supports continued investigation.

It does not support diagnosing yourself with a concussion and attacking a tub of creatine with a tablespoon.

If you've suffered a suspected concussion or TBI, seek appropriate medical evaluation.

The Bigger Picture: Creatine and the Brain

When you zoom out, an interesting pattern emerges.

Creatine doesn't appear to be some universal intelligence potion.

Instead, its cognitive effects may become more noticeable when the brain's energy demands increase.

Research has investigated creatine during:

• Sleep deprivation

• Prolonged mental work

• Combined physical and cognitive fatigue

• Hypoxic conditions

• Traumatic brain injury

That makes sense when you understand what creatine actually does.

It isn't a stimulant.

It doesn't magically increase motivation.

It helps support the cellular system responsible for rapidly maintaining ATP availability.

Your muscles use that system.

So does your brain.

Should You Take Creatine for Brain Health?

Creatine monohydrate already has one of the largest bodies of research of virtually any sports supplement.

Its benefits for strength, power, training performance, and lean mass are well established.

The neuroscience research adds another layer.

There is evidence that creatine supplementation can influence brain creatine availability and may support certain aspects of cognition, particularly when the brain is placed under substantial metabolic stress.

But the evidence isn't equally strong across every claim.

Creatine and exercise performance: extremely well established.

Creatine and cognition: promising, with effects varying between populations and conditions.

Creatine and sleep-deprived cognitive performance: increasingly interesting human evidence.

Creatine as a treatment for concussion or TBI: promising hypothesis with limited human clinical evidence.

Science isn't ruined by admitting what we don't know.

That's actually the whole point.

The Bottom Line

Creatine is not just a bodybuilding supplement.

It's part of one of the fundamental energy systems used throughout the human body, including the brain.

Research suggests creatine supplementation may help maintain aspects of cognitive performance when the brain is under significant metabolic stress, particularly during sleep deprivation and prolonged cognitive demand.

Research into traumatic brain injury is even more intriguing, but considerably less mature.

So should you throw away your coffee, sleep four hours a night, take creatine, and expect your brain to operate like a supercomputer?

Absolutely not.

Should we probably stop talking about creatine like its only purpose is helping Chad add five pounds to his bench press?

Yeah.

The science moved past that conversation a while ago.

Research

Gordji-Nejad A, et al. (2024). Single dose creatine improves cognitive performance and induces changes in cerebral high energy phosphates during sleep deprivation. Scientific Reports.

McMorris T, et al. (2006). Effect of creatine supplementation and sleep deprivation, with mild exercise, on cognitive and psychomotor performance, mood state, and plasma concentrations of catecholamines and cortisol. Psychopharmacology.

McMorris T, et al. (2007). Creatine supplementation, sleep deprivation, cortisol, melatonin and behavior. Physiology & Behavior.

Watanabe A, et al. (2002). Effects of creatine on mental fatigue and cerebral hemoglobin oxygenation. Neuroscience Research.

Sakellaris G, et al. (2006). Prevention of complications related to traumatic brain injury in children and adolescents with creatine administration. Journal of Trauma.

Sakellaris G, et al. (2008). Prevention of traumatic headache, dizziness and fatigue with creatine administration. Acta Paediatrica.

Dean PJ, et al. (2017). Potential for use of creatine supplementation following mild traumatic brain injury. Concussion.

Dolan E, Gualano B, Rawson ES. (2019). Beyond muscle: the effects of creatine supplementation on brain creatine, cognitive processing, and traumatic brain injury. European Journal of Sport Science.

This article is educational and is not medical advice. Traumatic brain injuries and suspected concussions should be evaluated by an appropriate medical professional.