Creatine for Brain Health: How a Well-Studied Supplement May Support Cognitive Function and Healthy Aging

Creatine has long been recognized as one of the most extensively studied dietary supplements, with decades of research supporting its safety and its role in muscle energy metabolism. More recently, scientists have turned their attention to a different question: how creatine fits into the broader conversation about creatine for brain health, cognitive function, and healthy aging.

The brain is one of the body's most energy-demanding organs, and interest in creatine for healthy aging has grown as researchers explore brain energy metabolism, mental fatigue, memory, and executive function. Early evidence suggests that creatine supplementation is being studied for its role in brain energy metabolism during aging and neurological research, although much of the work remains preliminary. Recent clinical studies provide encouraging signals that justify further investigation rather than firm conclusions.

Although the brain accounts for only about 2% of total body weight, it consumes nearly 20% of the body's total energy at rest. Every thought, memory, and nerve impulse depends on a continuous supply of adenosine triphosphate (ATP), the primary energy currency of cells.

Creatine helps maintain ATP levels through the phosphocreatine energy system. Within neurons, phosphocreatine donates phosphate groups to regenerate ATP whenever energy demand rises, enabling brain cells to continue functioning during periods of intense mental activity or metabolic stress (Balestrino and Adriano, 2019).

Unlike skeletal muscle, the brain stores relatively limited creatine reserves. During aging, sleep loss, or metabolic stress, neuronal ATP supply may fall short of demand. Increasing brain creatine stores through supplementation is one area researchers are studying to understand neuronal resilience under these conditions (Balestrino and Adriano, 2019).

Creatine supports brain function through several complementary mechanisms. It helps regenerate ATP during periods of increased energy demand, supports mitochondrial efficiency, and may reduce the buildup of reactive oxygen species, lowering oxidative stress. Adequate cellular energy also helps maintain neuronal membrane integrity and supports normal neurotransmission, both of which are relevant to learning, memory, and overall cognitive performance (Balestrino and Adriano, 2019).

Over the past decade, numerous randomized clinical trials have examined whether creatine supplementation influences cognitive performance.

A 2024 systematic review and meta-analysis published in Frontiers in Nutrition analyzed data from randomized controlled trials involving healthy adults and individuals with increased metabolic demands. The review reported modest but statistically meaningful improvements in several aspects of cognition, including:

• Working memory

• Short-term memory

• Information processing

• Attention

• Mental fatigue

The largest signals were observed among older adults, vegetarians, individuals with low dietary creatine intake, and people experiencing metabolic stress. Healthy young adults generally showed smaller improvements, likely because their baseline brain creatine stores were already adequate (Xu et al., 2024).

The authors emphasized that while the findings are encouraging, additional large-scale randomized clinical trials are needed to establish optimal dosing strategies and identify which groups are most likely to benefit. This is a key reason creatine and cognitive function continues to be an active area of research rather than a settled question.

Beyond general cognition, several lines of early research are examining how creatine intersects with brain energy metabolism in aging and in neurological conditions. The studies summarized below should be read as early science, not as evidence of clinical efficacy, and creatine should not be considered a treatment for any disease.

Early research on Alzheimer's disease

One often-cited 2025 study was a small, single-arm pilot at the University of Kansas involving twenty adults diagnosed with Alzheimer's disease who received 20 g/day of creatine monohydrate for eight weeks. The study did not include a placebo control group, so it cannot be interpreted as evidence of clinical efficacy. Compliance was high, and using magnetic resonance spectroscopy the investigators reported an approximately 11% increase in brain creatine concentrations, suggesting that oral creatine supplementation can raise brain creatine levels in this population (Smith et al., 2025).

Pilot data suggest changes on several cognitive measures, including global cognition, fluid cognition, executive function, working memory, and oral reading ability, alongside laboratory markers consistent with improved mitochondrial respiration and ATP production. Because the study was small and uncontrolled, these signals are best viewed as proof-of-concept findings that need to be tested in larger, randomized, placebo-controlled trials (Smith et al., 2025). Ongoing research is examining whether creatine supplementation affects clinical outcomes in this population.

Mental fatigue and sleep loss

One of the more consistent themes in the literature involves creatine mental fatigue research. Sleep deprivation impairs attention, reaction time, learning, and decision-making while raising the brain's energy requirements. Pilot data suggest that creatine supplementation may help maintain ATP availability during these periods, supporting cognitive performance under temporary sleep loss.

Importantly, creatine is not a substitute for adequate sleep. Current evidence indicates that it may support the brain's ability to cope with temporary increases in metabolic demand rather than replace healthy sleep, nutrition, and lifestyle habits (Xu et al., 2024).

Mood-related research

Creatine has been studied alongside standard care in mood-related research, with some clinical studies reporting faster symptom changes when creatine was added to conventional therapy, particularly among women. Because depression has been associated with impaired mitochondrial function and changes in brain energy metabolism, researchers are interested in whether supporting ATP production with creatine is relevant in this context.

Early research is studying these effects, and larger randomized clinical trials are needed before any general recommendations can be made. People living with depression should always work with a qualified healthcare provider rather than relying on supplements alone (Xu et al., 2024).

Neurodegenerative conditions

Beyond Alzheimer's disease, creatine is being studied for its role in brain energy metabolism during aging and neurological research, including in conditions such as Parkinson's disease, Huntington's disease, and amyotrophic lateral sclerosis (ALS). These conditions share features such as mitochondrial dysfunction, impaired ATP production, and oxidative stress.

Because creatine functions as an intracellular energy buffer, researchers are studying whether increasing brain creatine stores might support neuronal energy balance under metabolic stress. Current evidence in this area remains preliminary, and ongoing clinical trials will help determine whether it affects clinical outcomes (Balestrino and Adriano, 2019).

Hypoxia and brain injury

Experimental research, mostly in animal and preclinical models, is also studying whether creatine influences neuronal energy balance during conditions associated with reduced oxygen availability, including hypoxia, stroke, and traumatic brain injury. Early findings suggest possible effects on ATP availability, mitochondrial function, and oxidative stress, but human evidence in these areas is limited and should not be interpreted as a basis for self-treatment. Larger human studies are needed before any clinical conclusions can be drawn (Xu et al., 2024).

From the standpoint of creatine for healthy aging, current evidence suggests that the clearest cognitive signals appear in groups with lower baseline creatine stores or higher metabolic demands. These include:

• Older adults focused on healthy cognitive aging

• Vegetarians and vegans

• Individuals with low dietary creatine intake

• Shift workers

• People experiencing chronic mental fatigue

• Those going through periods of temporary sleep deprivation

• Individuals with neurological conditions, only under the guidance of a healthcare provider

Healthy young adults consuming adequate dietary creatine generally show smaller cognitive shifts because their brain creatine stores are already relatively high (Xu et al., 2024).

Creatine monohydrate remains one of the most extensively studied dietary supplements available. Clinical studies consistently report that 3 to 5 g/day is safe for healthy adults during long-term use. Some neurological studies have used higher doses, such as 20 g/day, specifically to raise brain creatine concentrations in research settings (Smith et al., 2025).

Some individuals may experience mild gastrointestinal discomfort or temporary water retention during the early stages of supplementation. Blood creatinine levels may rise modestly because creatinine is a normal metabolite of creatine, and this does not, on its own, indicate kidney damage in healthy individuals. People with pre-existing kidney disease, or anyone on medications, should consult a healthcare provider before adding creatine (Mayo Clinic, 2026). These statements are educational and are not medical advice.

Despite growing interest in creatine and cognitive function, several important questions remain unanswered. Many published studies are relatively small and short. Researchers are still working out the most useful dosage strategies for brain-related outcomes, the duration of supplementation needed to observe meaningful effects, and whether creatine affects clinical outcomes in conditions that involve impaired brain energy metabolism. Large, multicenter, randomized, placebo-controlled trials will be essential to confirm and refine the signals reported in early studies.

Scientific understanding of creatine has expanded considerably over the past decade. Once viewed primarily as a sports nutrition supplement, creatine is now being explored as part of a broader conversation about brain energy metabolism, mental fatigue, and healthy cognitive aging.

Its established role in cellular energy metabolism provides a strong biological foundation for ongoing research into creatine for brain health. Recent clinical work, including a small single-arm pilot reporting increased brain creatine concentrations and exploratory cognitive measurements in adults with Alzheimer's disease, has strengthened scientific interest in this area, although findings should not be interpreted as evidence of clinical efficacy.

At this time, creatine is not a treatment for any neurological condition. From a consumer standpoint, current evidence is most relevant to supporting brain energy metabolism, helping with creatine mental fatigue research, and as part of a broader strategy for healthy aging, particularly in older adults and individuals experiencing metabolic stress. As larger trials emerge, creatine may become an increasingly visible part of evidence-based nutritional approaches to long-term cognitive wellness.