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Creatine Supplementation and the Muscle-Brain Axis in Aging

By the CreatineIQ Research Desk
New Research
Older Adults
Musculoskeletal
Brain Health

As the human body ages, it experiences progressive declines in both neuromuscular and cognitive functions, often leading to reduced independence and a lower quality of life. Recently, scientific focus has shifted toward the "muscle-brain axis"—the bidirectional communication pathway connecting skeletal muscle health with cognitive performance.

A 2025 narrative review evaluated the specific effects of combining creatine supplementation with exercise interventions on physical and cognitive outcomes in older adults, examining how this combination reinforces the muscle-brain axis.

Key Takeaways

  • Physical Restoration: Creatine, particularly when combined with resistance training, significantly improves muscle strength, lean body mass, and functional capacity in the elderly.
  • Cognitive Preservation: Modest improvements were observed in memory, processing speed, and executive function, especially in individuals with low baseline creatine levels.
  • Mechanisms of Action: Creatine supports energy metabolism and mitochondrial stability, while exercise stimulates the release of neuroprotective myokines from muscles.
  • Synergistic Benefits: The combination of creatine and structured exercise appears to be a highly effective, safe strategy for counteracting age-related decline.

The Study Design

This paper is a narrative review that synthesized data from clinical and preclinical studies, including randomized controlled trials and meta-analyses. The research focused specifically on older populations undergoing creatine supplementation protocols combined with various exercise interventions.

The Findings

The review confirmed the well-established benefits of creatine on aging muscles: significant improvements in lean mass, strength, and daily functional capacity when combined with resistance training.

More notably, the review highlighted cognitive improvements. Older adults supplementing with creatine showed modest but meaningful enhancements in short-term memory, executive function, and cognitive processing speeds. The review posits a clear mechanistic link: creatine directly stabilizes mitochondrial function and ATP availability in both muscle and brain tissue, while the act of exercising causes muscles to release myokines—signaling molecules that travel to the brain to promote neuroplasticity.

Analyzing the Study: Strengths & Limitations

Strengths and Reputability

The review does an excellent job of connecting the physical and cognitive benefits of creatine into a unified framework (the muscle-brain axis), providing a strong mechanistic explanation for why exercise and creatine are so synergistic in older adults.

Limitations

  1. Narrative, Not Systematic: The paper is a narrative review rather than a systematic review or meta-analysis. It reports no search strategy, no inclusion criteria and no quality appraisal of the studies it draws on, so there is no way for a reader to check what was left out or why. This is the single biggest constraint on how much weight the conclusions can carry.
  2. Single Author: The review is the work of one author at one institution. Systematic reviews normally use at least two independent screeners precisely because one person's judgement about what to include is hard to audit.
  3. Modest Cognitive Effects: The cognitive benefits, while present, are repeatedly described as "modest" — creatine is not a standalone treatment for severe age-related cognitive decline such as dementia, and nothing here suggests otherwise.
  4. Mixed Evidence Base: The review draws on preclinical alongside clinical work. Mechanistic findings in animal or cell models support plausibility but do not establish effects in older adults.

Conflicts of Interest

The author declared that the work was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.

Conclusion

The "muscle-brain axis" is a useful frame, and this review assembles the mechanistic story behind it clearly: creatine supports energy metabolism and mitochondrial stability, exercise drives myokine signalling and neuroplasticity, and the two plausibly reinforce each other in older adults.

On impact, this is a synthesis rather than new evidence, and a narrative one at that. Its underlying claim — that creatine combined with resistance training improves strength, lean mass and functional capacity in older adults — rests on a body of randomised trials that is genuinely solid and does not depend on this paper. The cognitive half of the argument is weaker: those effects are consistently described as modest and are strongest in people who start with low creatine stores. Without a stated search method or independent screening, a reader cannot tell how selectively the supporting literature was chosen. Read it as a well-argued orientation to a real and reasonably well-supported idea, not as an independent verdict on it.

References

  1. Li N. Creatine supplementation and exercise in aging: a narrative review of the muscle-brain axis and its impact on cognitive and physical health. Front Nutr. 2025;12:1687719. doi:10.3389/fnut.2025.1687719.