Forbes et al. 2023: Creatine and Brain Function Meta-Analysis

Study Overview

Citation: Forbes SC, Cordingley DM, Cornish SM, et al. (2023). Effects of creatine supplementation on brain function and health. Nutrients, 14(5), 921.

This meta-analysis pooled data from multiple randomized controlled trials examining creatine’s effects on various cognitive domains. It provided the most comprehensive quantitative assessment of creatine’s brain benefits to date.

Key Findings

Cognitive Domains Affected

The meta-analysis found creatine supplementation significantly improved short-term memory performance, reasoning and intelligence scores, and cognitive performance under stress or fatigue. Effects were smaller or non-significant for long-term memory and simple reaction time in rested individuals.

Population Differences

Vegetarians and vegans showed larger cognitive improvements than omnivores, consistent with the saturation ceiling hypothesis — individuals with lower baseline brain creatine have more room for improvement. Older adults also showed meaningful benefits.

Dose and Duration

Studies using 5g daily for 4 or more weeks showed the most consistent cognitive benefits. Shorter supplementation periods or lower doses produced less reliable results, suggesting brain creatine saturation takes longer than muscle saturation.

Practical Implications

1. 5g daily minimum for brain benefits — lower doses may be insufficient for cerebral creatine saturation
2. Allow 4-8 weeks — brain benefits take longer to manifest than muscle benefits
3. Vegetarians are super-responders cognitively — the most dramatic improvements occur in those with lowest baseline stores
4. Stress and sleep deprivation amplify benefits — creatine is most beneficial when the brain is under energy stress

Malaysian Relevance

For Malaysian students preparing for exams, professionals working long hours, and shift workers in healthcare and manufacturing, this research supports creatine as a safe cognitive support tool. Malaysian vegetarians from Hindu and Buddhist communities are particularly likely to experience significant cognitive benefits.

Sources and References

• Forbes SC, et al. (2023). Creatine and brain function. Nutrients, 14(5), 921.
• Kreider RB, et al. (2017). ISSN position stand. JISSN, 14, 18.

Study Limitations

As with any individual study, several limitations should be considered when interpreting these findings:

• Sample size — many creatine studies use relatively small sample sizes, which can limit statistical power and generalizability
• Study population — results from young, trained males may not directly apply to women, older adults, or untrained individuals
• Duration — short-term studies may not capture long-term effects or the full trajectory of adaptation
• Dosing protocol — variations in loading and maintenance doses across studies make direct comparisons challenging
• Outcome measures — different studies use different performance tests, making meta-analytic comparisons complex

These limitations do not invalidate the findings but should be considered when applying them to individual supplementation decisions.

What This Means for You

For the average creatine user, this research supports the following practical recommendations:

1. Choose creatine monohydrate — it remains the most studied and effective form
2. Take 3-5g daily — consistent daily dosing is more important than timing
3. Take it with food — insulin response from meals enhances muscle uptake
4. Be patient — full saturation takes 3-4 weeks without loading
5. Combine with exercise — creatine works best when paired with resistance or high-intensity training

For more on practical dosing strategies, see our creatine dosage guide.

Study Design and Methodology

Understanding how a study was designed helps assess the strength of its conclusions. Key methodological factors to evaluate include:

• Sample size — larger studies (n=50+) provide more reliable results than small studies (n=10-15). Small sample sizes increase the risk of false positives and limit the ability to detect moderate effect sizes
• Study duration — creatine research requires adequate duration for muscle saturation (minimum 4 weeks for maintenance dosing, 1 week for loading). Studies shorter than this may miss the full effect
• Blinding — double-blind, placebo-controlled designs (where neither researchers nor participants know who receives creatine) are the gold standard for minimising bias
• Population studied — results from trained athletes may not fully apply to untrained individuals, and vice versa. Age, sex, and dietary habits (particularly vegetarian status) also influence creatine response
• Outcome measures — direct measures (muscle biopsy, MRS imaging) are more informative than indirect proxies (blood markers, performance tests) for assessing creatine uptake and metabolism

Clinical Implications and Practical Relevance

This research contributes to our understanding of creatine in several practical ways:

For athletes and fitness enthusiasts: The findings support the use of creatine monohydrate as a safe, effective ergogenic aid. The standard dosing protocol of 3-5g daily remains well-supported by the cumulative evidence base including this study.

For healthcare professionals: Understanding the specific mechanisms and safety data from studies like this helps clinicians provide evidence-based guidance to patients who ask about creatine supplementation. The research consistently shows a favourable safety profile at recommended doses.

For the Malaysian context: While most creatine research is conducted in Western populations, the fundamental biochemistry (ATP-phosphocreatine system) is universal. Malaysian consumers can apply these findings with confidence, adjusting for local factors like tropical climate (increased hydration needs) and halal dietary requirements (synthetic creatine monohydrate is permissible).

How This Fits Into the Broader Evidence

No single study should be used to make definitive claims about creatine supplementation. Instead, this research should be viewed as one piece of a much larger evidence base:

• The ISSN Position Stand (2017) synthesises hundreds of studies into comprehensive recommendations
• Multiple systematic reviews and meta-analyses confirm creatine’s effects on strength, power, and lean mass
• Long-term safety data spanning up to 5 years shows no adverse effects at recommended doses

For a complete overview of the evidence, explore our Research Library which covers 60+ landmark creatine studies.

Further Reading

• creatine dosage guide
• creatine safety profile
• creatine for muscle building
• creatine for brain health
• how creatine works
• creatine loading phase

Sources & References

Full citations available in our Research Library.