Creatine isn't just for muscles.

It may just be one of the most under-appreciated players in brain health.

That being said, we still don't have a great idea of how, or if, it directly improves measures of cognitive function, especially in certain populations like older adults.

This is relevant because aging lowers muscle and likely brain creatine stores, due to a decline in muscle mass and reduced dietary intake (or both). Aging represents a scenario where creatine supplementation might matter more for brain health.

A new review isolated creatine-specific effects on cognitive function. Across 6 studies, 5 reported benefits—mostly faster and more accurate performance on attention tasks and better short‑term and visuospatial memory. Global measures, on the other hand, didn’t budge.

It's the first study to pull together data from randomized controlled studies and observational data in this age group, and it adds to our growing understanding of the role of creatine for brain health.

Dietary and Supplemental Creatine Improve Cognitive Function

The review included two double-blind interventions of creatine supplementation (one lasting 24 weeks and another lasting 1 week) and four cross-sectional studies on dietary creatine intake The participants ranged in age from 67–78 years old.

The first randomized controlled study lasted 24 weeks and included only postmenopausal women who were supplemented with 5 grams per day of creatine monohydrate (after a 5-day loading phase of 20 grams per day). It found no cognitive benefit of creatine supplementation (including on measures of global cognitive function, attention, processing speed, and memory), even when combined with resistance exercise training.

In the second intervention study, participants were given 20 grams of creatine daily (four 5-gram doses per day) for 1 week. Some cognitive measures—including short- and long-term memory—improved after the intervention while others—including executive function—didn't change.

Findings from the observational studies were more consistent—all four reported a positive association between dietary creatine and cognitive function.

• Dietary creatine intake of >1 gram per day (27 women aged 67–71) was associated with better attention and inhibition (measured using the incongruent Flanker test) but not with scores on the mini mental state examination (MMSE—a validated tool for screening and monitoring cognitive impairment such as dementia).

• Consuming more than 0.38 grams of creatine per day (42 adults aged 67–71) was associated with better visuo-spatial short-term memory but no association was observed for MMSE scores.

• A large cross-sectional study of 1,340 US adults (average age of 71) found an association between higher dietary creatine intake (>0.95 grams per day) and faster processing speed.

To quote the authors:

"The current limited evidence suggests that creatine may be associated with benefits for cognition in generally healthy older adults. However, high-quality clinical trials are warranted to further validate this relationship."

These findings align with those of another systematic review on creatine and cognitive function involving mostly younger healthy adults. Creatine supplementation improved short-term memory function, whereas results for long-term memory, spatial memory, attention, executive function, response inhibition, word fluency, reaction time, and mental fatigue were inconsistent or revealed no benefit for creatine over placebo.[1]

What can we conclude based on this (albeit limited) evidence? 

Creatine may have beneficial effects on some specific cognitive functions like memory or processing speed but is less effective at enhancing global cognitive function, at least in healthy older and young adults. The domain-specific effects are interesting, and they suggest creatine's neurobiological effects are unique to tasks requiring faster processing or quicker memory retrieval. That aligns with how creatine works in the muscle—it provides a rapid source of energy for fast, powerful muscle contractions. It's an interesting parallel to draw.

Cognitive functioning across quartiles of average daily dietary intake (0–0.4; 0.41–0.94; 0.95–1.57; and 1.58–10.83 grams per day, respectively) of creatine in NHANES 2001–2002 participants aged 60 years and over. Ostojic, S.M., et al. Dietary creatine and cognitive function in U.S. adults aged 60 years and over. doi: 10.1007/s40520-021-01857-4.

Creatine is Causal for Healthy Cognition

Creatine is a requirement for normal cognitive function. We know that because of what happens when brain creatine levels are inadequate.

Creatine transporter deficiency is a condition caused by a loss-of-function variant in SLC6A8—the gene that provides instructions for making the creatine transporter protein. It produces low brain creatine levels and results in prominent intellectual disability, seizures, autistic-like features, and motor & cognitive impairments. The disorder strongly illustrates that brain creatine is causal for proper cognition and that effective uptake across the blood-brain barrier (via the creatine transporter) is a requirement for normal brain function. 

The blood-brain barrier is the major supply route bringing creatine from the blood to the brain. When transport fails, brain creatine declines, and cognition suffers.

Another creatine deficiency syndrome is the result of deficiencies in one of two enzymes responsible for creatine synthesis (AGAT and GAMT). In these conditions, transport is intact but creatine biosynthesis is impaired; as a result, long-term high-dose creatine therapy can replenish brain creatine stores to normal and improve clinical features in these patients.

These two conditions illustrate that 1) creatine is causal for proper cognition and 2) creatine supplementation is effective at increasing brain creatine stores… as long as the dose is high enough.

In fact, dosing may be the most important factor when it comes to creatine and brain health. 

5 grams of creatine per day saturates muscles after a few weeks, but the brain needs a much higher dose, likely between 10 and 20 grams per day. This amount increases brain creatine stores by 3–10% over a period of 4 weeks or more (still less than half that usually seen for skeletal muscle). This has been confirmed using MRS studies that actually measure brain creatine levels (unlike any of the studies mentioned in the review cited above).

The need for a higher dose likely comes down to a potential "spillover" effect (explained by Dr. Darren Candow in episode #100 of the FoundMyFitness podcast). 

When you take a typical “maintenance” dose of creatine (3–5 grams per day), most of it is taken up by muscle and other peripheral tissues, which have a huge storage capacity and high expression of the creatine transporter. That leaves little creatine in the bloodstream, certainly not enough to push more creatine across the concentration gradient of the BBB. For this to happen, you need higher and more sustained plasma creatine concentrations, which is what you get with a "loading-style" dose of 10–20 grams per day for several weeks.

Tying this back to the review—the aging studies (at least one of them) used absolute doses of 20 grams per day in the loading phase and then 5 grams per day but did not measure brain creatine, making it impossible to tell whether dosing actually engaged the CNS target in older adults. And the observational studies—in addition to not measuring brain creatine—included participants who weren't consuming a lot of dietary creatine and probably weren't supplementing with it either. This likely explains the "null" or generally underwhelming results across studies.

Final thoughts

So, back to our initial question. Does creatine improve cognition? 

The nuanced answer: Probably yes for specific domains (memory, attention) in certain populations, but evidence quality is modest and not yet definitive.

Who might benefit most? Older, diseased, or stressed individuals may gain more than younger, healthy adults—consistent with the idea that creatine helps when energy demands outstrip reserves.

In other words, we shouldn't expect to see a benefit of creatine unless two conditions are present: 1) creatine is supplemented at a dose of 10–20 grams per day or 2) creatine supplement occurs alongside a "cognitive stress" like sleep deprivation or age-related cognitive decline.

It's also important to remember that creatine also doesn't improve cognitive function in the classical way that we think about supplements, caffeine, and other interventions—it's not a "nootropic." Its benefits are subtle, below the surface, and only revealed when the brain is in a so-called "energy crisis."

None of this means that creatine isn't potentially useful. I still take creatine in the hope that it's lending me some cognitive protection throughout life, and in the hopes that when I do eventually struggle with sleep, jet lag, or other stressor, it will help keep my brain resilient.

I swear by a 20-gram dose when I'm sleep deprived... it's better than coffee.

Warm regards

— Rhonda and the FoundMyFitness team