Dolan et al. 2019: Beyond Muscle — A Systematic Review of Creatine's Non-Athletic Benefits

TL;DR — Dolan et al. 2019

Dolan, Gualano, and Rawson published a systematic review in the European Journal of Sport Science (2019) that expanded the conversation about creatine beyond its traditional athletic context.

The paper systematically evaluated evidence that creatine supplementation increases brain creatine stores, enhances cognitive processing, and may provide neuroprotection after traumatic brain injury (Dolan et al., 2019) .

This review helped shift the scientific narrative toward creatine as a brain nutrient, not merely a muscle supplement.

Background

While creatine’s ergogenic effects on muscle performance have been thoroughly established through hundreds of studies, its role in non-muscular tissues received comparatively little attention until the 2010s.

The brain, despite being only 2% of body mass, uses approximately 20% of the body’s energy — making it a prime candidate for creatine supplementation benefits.

Dolan and colleagues recognized that scattered evidence across multiple domains needed to be synthesized into a cohesive review.

Key Findings

Brain Creatine Content

Using magnetic resonance spectroscopy (MRS) data, the review confirmed that oral creatine supplementation can increase creatine concentrations in the brain.

However, the increase is more modest than in skeletal muscle:

• Brain creatine increases are typically 5-10%, compared to 20% in muscle
• Higher doses (up to 20 g/day) or longer durations may be needed for meaningful brain uptake
• The blood-brain barrier limits creatine transport, explaining the attenuated response

Cognitive Processing

The review compiled evidence from multiple randomized controlled trials showing cognitive benefits from creatine supplementation.

Drawing on work by Rae et al. (2003) (Rae et al., 2003) and the meta-analysis by Avgerinos et al. (2018) (Avgerinos et al., 2018) , the authors noted that:

• Short-term memory and reasoning improved with creatine supplementation
• Benefits were most pronounced under conditions of metabolic stress (sleep deprivation, mental fatigue)
• Vegetarians and vegans showed the largest cognitive improvements, likely due to lower baseline brain creatine

Traumatic Brain Injury

The review presented compelling evidence from preclinical research, including Sullivan et al. (2000) (Sullivan et al., 2000) , showing that creatine supplementation before TBI reduced cortical damage by up to 50% in animal models.

The authors called for more human clinical trials to translate these findings.

Practical Implications

1. Creatine supports brain energy: Anyone with high cognitive demands — students, professionals, elderly — may benefit from supplementation
2. Stress amplifies the benefit: People experiencing sleep deprivation, jet lag, or mental fatigue may see the greatest cognitive improvements
3. Vegetarians benefit most: Those with low dietary creatine intake have the most room for brain creatine improvement
4. Standard dosing may be sufficient: While higher doses may increase brain uptake, 3-5 g/day over extended periods can still benefit brain creatine stores

Malaysian Context

The implications are relevant for Malaysian university students facing exam stress, shift workers dealing with sleep disruption, and the growing elderly population at risk of cognitive decline.

Creatine supplementation offers an affordable, safe intervention that complements healthy lifestyle habits.

Limitations

• Limited number of MRS studies directly measuring brain creatine changes
• Most cognitive studies had small sample sizes
• TBI evidence remains primarily preclinical
• Optimal dosing for brain-specific outcomes is not yet established

Full Citation

Dolan E, Gualano B, Rawson ES.

Beyond muscle: the effects of creatine supplementation on brain creatine, cognitive processing, and traumatic brain injury. European Journal of Sport Science.

2019;19(1):1-14. doi:10.1080/17461391.2018.1500644

Where This Fits in the Evidence

Dolan, Gualano and Rawson’s “Beyond Muscle” set out to do something the field had not: gather the scattered non-athletic evidence — brain creatine uptake, cognition, and traumatic brain injury — into one systematic review. Its measured conclusion is that creatine does reach the brain, but more slowly and modestly than muscle, and matters most when the brain is under metabolic stress. By drawing together threads from Rae et al. (2003), the Avgerinos et al. (2018) meta-analysis and the preclinical TBI work of Sullivan et al. (2000), it gave the “creatine as brain nutrient” idea a credible spine — while staying candid that the TBI case remains largely preclinical. The wider cognitive and clinical literature is collected in our research library.

Sources & References

This article is based on the systematic review by Dolan et al. published in EJSS (2019) and contextualized with Rae et al. (2003), Avgerinos et al. (2018), and Sullivan et al. (2000).

All citations reference PubMed-indexed publications.

Further Reading

• creatine dosage guide
• creatine safety profile
• creatine for muscle building
• creatine for brain health
• how creatine works
• buying creatine in Malaysia