Systematic review shows creatine supplementation improves depressive symptoms in mental health disorders — Evidence Review
Published in Brain Medicine, by researchers from University of Ottawa
Researched by
— the AI search engine for science
Table of Contents
A new systematic review suggests that creatine supplementation shows promise as an adjunct treatment for depression, but the evidence is mixed and not yet conclusive. Most related studies broadly support the possibility of creatine’s beneficial effects on mood, though findings vary by population and study design, as highlighted in the original study.
- Clinical trials in women with major depressive disorder (MDD) have shown significant reductions in depressive symptoms with creatine augmentation, but results are less consistent in broader or mixed populations, and concerns about safety in bipolar disorder remain 1 2 4.
- Animal and human studies indicate sex-specific and condition-specific effects, with some evidence that creatine’s antidepressant-like effects may be more pronounced in females or when combined with other treatments 1 5.
- Several reviews and experimental studies support creatine’s positive impact on brain energy metabolism and mood, particularly under stress or cognitive demand, but call for larger, longer trials to clarify its therapeutic role 6 7 9 10.
Study Overview and Key Findings
Interest in non-traditional treatments for depression continues to grow as standard therapies do not work for all patients. This new systematic review, led by researchers at the University of Ottawa, is timely given creatine’s popularity as a sports supplement and its emerging role in brain health research. The study is notable for synthesizing results from diverse international randomized controlled trials (RCTs), highlighting both the therapeutic potential and limitations of creatine for mood disorders.
| Property | Value |
|---|---|
| Study Year | 2026 |
| Organization | University of Ottawa |
| Journal Name | Brain Medicine |
| Authors | Bassam Jeryous Fares, Carl Zhou, Nicholas Fabiano, Stanley Wong |
| Population | Participants with major depressive disorder and bipolar disorder |
| Sample Size | 238 participants |
| Methods | Systematic Review |
| Outcome | Depressive symptoms, remission rates |
| Results | Two trials showed significant improvements in depressive symptoms. |
The systematic review analyzed six reports from five RCTs, encompassing 238 participants across multiple countries. While two trials demonstrated notable improvements in depressive symptoms with creatine—especially when combined with standard antidepressant therapy—three other trials found no significant benefit. Importantly, safety concerns were noted in bipolar disorder, where a small number of participants developed hypomania or mania.
Literature Review: Related Studies
To provide context for these findings, we searched the Consensus database, which includes over 200 million research papers. The following search queries were used:
- creatine depression treatment effects
- creatine supplementation mental health outcomes
- exercise creatine mood improvement research
Below, we organize major themes from the literature and summarize key findings.
| Topic | Key Findings |
|---|---|
| How effective is creatine as an adjunct treatment for depression? | - Creatine supplementation enhances SSRI efficacy in women with MDD, likely via effects on brain energy metabolism and network connectivity 1. - Some RCTs and open-label studies find beneficial effects in unipolar depression, but results are inconsistent, and safety concerns exist in bipolar disorder 1 2 4. |
| Are there sex-specific or condition-specific effects of creatine? | - Creatine’s antidepressant-like effects are more robust in female rodents and women, possibly influenced by hormonal status 1 5. - In bipolar disorder, creatine may increase risk of manic switch, suggesting caution in this population 2 4. |
| Does creatine supplementation affect cognitive function and mood? | - Creatine improves memory, mood, and cognitive performance under certain conditions (e.g., sleep deprivation, older adults), but not all studies find significant effects in healthy populations 8 11 12 13. - Creatine may increase brain creatine content, which could support cognitive and emotional health 7 9 10. |
| What mechanisms might explain creatine’s impact on brain health? | - Creatine modulates brain energy metabolism, increases N-acetylaspartate, and influences neurotransmitter systems linked to mood regulation 1 3 6. - Animal studies show that creatine can reverse depressive-like behaviors via PI3K/Akt/mTOR pathway and increase neurotrophic factors 3. |
How effective is creatine as an adjunct treatment for depression?
Multiple studies support the idea that creatine can enhance the effects of standard antidepressants, particularly in women with MDD, as shown by improved symptom reduction and neuroimaging markers 1. However, results are mixed across broader and more diverse populations, and not all trials find significant benefits, especially in treatment-resistant or adolescent populations 2 4 13.
- RCTs in women with MDD receiving SSRIs show greater symptom reduction and brain metabolic improvements with creatine 1.
- Open-label and controlled trials in unipolar depression report beneficial effects, but bipolar participants may be at risk for manic switches 2 4.
- In bipolar depression, creatine did not significantly improve depressive symptoms, but some participants reached remission; however, risk of hypomania/mania was noted 2.
- Some studies found no additive benefit of creatine with strength training or in older women without baseline cognitive impairment 13.
Are there sex-specific or condition-specific effects of creatine?
Evidence suggests that creatine’s efficacy may differ by sex and psychiatric condition. Animal and human studies indicate more pronounced antidepressant responses in females, with possible hormonal influences 1 5. However, caution is warranted in bipolar disorder due to the risk of manic episodes 2 4.
- Female rodents and women respond more robustly to creatine supplementation, especially when combined with antidepressants 1 5.
- Ovarian hormones may influence the antidepressant-like effects of creatine 5.
- In bipolar disorder, creatine supplementation has been linked with the onset of hypomania or mania in some cases 2 4.
- Effects in males and in non-depressed populations are less consistent or absent 5 13.
Does creatine supplementation affect cognitive function and mood?
The literature indicates that creatine may improve certain aspects of cognitive function and mood, especially under stress (e.g., sleep deprivation) or in populations with lower baseline brain creatine levels (e.g., older adults) 7 8 9 10 11 12. However, findings are variable, and some studies show no effect in healthy, non-stressed participants 13.
- Creatine supplementation improves memory performance in healthy older adults and under conditions of cognitive stress 8 11 12.
- Supplementation can improve complex executive function during sleep deprivation 12.
- Not all studies find a benefit in cognitive or emotional outcomes in healthy individuals or with strength training alone 13.
- Reviews suggest creatine’s cognitive benefits may be most noticeable in conditions of brain creatine deficit or increased cognitive demand 7 9 10.
What mechanisms might explain creatine’s impact on brain health?
Creatine’s role in cellular energy metabolism, neuromodulation, and neuroprotection underpins its potential impact on mood and cognition 1 3 6. Mechanistic studies indicate that creatine increases brain energy metabolites, supports neurotransmitter function, and may activate pathways involved in synaptic plasticity and neurotrophic support 1 3.
- Neuroimaging studies link creatine supplementation to increased N-acetylaspartate and structural brain network connectivity in patients with MDD 1.
- Animal studies show creatine reverses depressive-like behaviors via activation of the PI3K/Akt/mTOR signaling pathway, similar to ketamine 3.
- Creatine may modulate serotonin and dopamine systems, which are central to mood regulation 6.
- There is a need for more research on optimal dosing strategies to affect brain creatine levels and clarify these mechanisms in humans 9 10.
Future Research Questions
While interest in creatine as a potential adjunct for depression is growing, the current evidence base is limited by small sample sizes, sex imbalances, and heterogeneity in study design and populations. Future research should address these gaps and clarify the long-term safety, optimal dosing, and specific subgroups most likely to benefit.
| Research Question | Relevance |
|---|---|
| What are the long-term effects of creatine supplementation on depression? | Most trials to date are short-term (≤8 weeks); understanding long-term efficacy and safety is critical, especially given the risk of manic switch in bipolar disorder 2 4 10. |
| Does creatine work differently for men and women with depression? | Sex-specific responses have been observed in both animal and human studies, suggesting the need to clarify biological and hormonal factors influencing treatment effectiveness 1 5. |
| Is creatine safe and effective for bipolar depression? | Mixed findings and reports of hypomania/mania in bipolar participants highlight the need for dedicated safety and efficacy studies in this population 2 4. |
| Does combining creatine with exercise or antidepressants enhance treatment for depression? | Some studies suggest synergistic effects with antidepressants or exercise, but results are inconsistent; research should clarify optimal combination strategies 1 13. |
| What is the optimal dose and duration of creatine supplementation for brain health? | The best dosing regimen to increase brain creatine and support mood/cognition is unknown, with evidence suggesting higher or longer dosing may be needed for brain effects 7 9 10. |
Further research answering these questions will be essential to determine whether creatine could become a standard adjunct in depression treatment and which patients are most likely to benefit.