Creatine

Disclaimer: The information presented in this section is for educational and informational purposes only. It is not intended as medical advice. No supplement discussed on this site has been proven to prevent, stop, or reverse neurodegenerative disease. While some supplements have been studied for their potential to support aspects of cellular function, any observed effects are generally modest, variable between individuals, and highly context-dependent. Before starting any supplement, consult with a qualified healthcare professional. Appropriate professionals may include a physician, neurologist, pharmacist, nurse practitioner, physician assistant, or registered dietitian. This does not refer to wellness influencers, supplement sellers, health coaches, or practitioners without medical training in pharmacology, neurology, and drug-supplement interactions. Supplements may interact with medications or produce unintended side effects. The inclusion of any supplement on this site does not constitute a recommendation for use. Descriptions of mechanisms or research findings are provided to improve understanding of current scientific investigation, not to guide individual treatment decisions.

Overview

Creatine is a naturally occurring compound involved in cellular energy buffering, especially in tissues with high and fluctuating energy demand such as muscle and nerves. It is best known as a sports supplement, but in neurodegeneration it is often claimed to support mitochondrial function, preserve neuronal energy status, and improve cognition or physical function.

There is promising research coming out, but it’s still early. It has one of the cleaner mechanistic rationales in the supplement space, especially for disorders involving bioenergetic stress, but the clinical evidence in neurodegenerative disease is still limited.

Proposed Mechanisms

Creatine helps meet ATP demand through the phosphocreatine system, which may make stressed neurons or muscle cells more resilient during energetic strain. Proposed brain mechanisms include support of mitochondrial energetics, reduced metabolic stress, and possibly lower oxidative burden.

This makes creatine especially attractive in diseases where mitochondrial dysfunction and energy failure are central themes, including Huntington’s, Parkinson’s, and Alzheimer’s. The key issue is not whether the mechanism makes sense, rather it’s whether enough creatine reaches relevant tissues and changes meaningful outcomes in patients.

Evidence Summary

Preclinical: Preclinical evidence is generally favorable. Animal and cell-culture studies often show that creatine can improve bioenergetic markers or reduce injury in models of neurodegeneration or stress. These data are one reason the supplement keeps returning in translational discussions.

Translational / RCT / observational: Human evidence is still weak-to-early. A 2025 pilot study in Alzheimer’s disease suggested feasibility and preliminary signals for improved muscle outcomes and possibly brain-energy-related measures, but it was small and not definitive. More broadly, reviews continue to describe creatine as promising, but not established, for neurodegenerative disease.

Evidence level

Low-to-moderate.

Creatine has stronger mechanistic plausibility than many supplements and a relatively good general safety profile, but it still lacks large, convincing clinical trials showing that it slows neurodegeneration or meaningfully improves cognition in a durable way.

Limitations

The biggest limitation is that brain delivery and target engagement remain difficult to verify cleanly, and many studies are small, short, or focused on feasibility rather than disease progression. Positive findings in muscle or function do not prove neuroprotection.

Another limitation is disease heterogeneity. Creatine may be more useful in disorders with major energetic impairment than in disorders driven more by proteinopathy or inflammation, but that remains an inference rather than a settled fact.

Safety and Considerations

Creatine is generally considered safe in healthy adults at standard doses, but gastrointestinal effects, water retention, and practical issues around dose and adherence matter. In medically complex patients, especially those with renal concerns, supplement decisions should be individualized.

Sources

Xu C et al. “The effects of creatine supplementation on cognitive function in adults: a systematic review and meta-analysis of randomized controlled trials.” 2024.
Smith AN et al. “Creatine monohydrate pilot in Alzheimer’s: Feasibility, brain creatine, cognition, and muscle.” 2025.
Wang K et al. “Creatine-weighted imaging in patients with Parkinson’s disease.” 2025.