Systematic review indicates mixed effects of creatine on depression symptoms — Evidence Review

Creatine, a common sports supplement, may have potential as an adjunct treatment for depression, according to a new systematic review, but findings remain mixed and inconclusive. Most related research aligns with these cautious results, showing some benefit in select populations but not enough evidence for broad clinical recommendations; see the original study source.

• Several randomized controlled trials in women with major depressive disorder (MDD) report that creatine supplementation alongside standard antidepressant therapy may lead to faster and more substantial improvements in depressive symptoms, supporting a possible adjunctive role 1 2.
• However, other studies—including those involving adolescents with treatment-resistant depression or individuals with bipolar disorder—found no significant benefit from creatine, indicating that its efficacy may depend on patient characteristics, concurrent therapies, and underlying conditions 3 4.
• Reviews on creatine’s impact on brain health and psychiatric disorders agree that creatine influences brain energy metabolism and may be safe, but emphasize the need for more robust, well-powered studies to determine true clinical utility and optimal dosing 6 7 8.

Study Overview and Key Findings

Creatine is widely used for its muscle-building properties, but growing evidence suggests it may also affect brain energy metabolism and mood disorders. The new systematic review, led by researchers at the University of Ottawa, is timely given the urgent need for novel treatments for depression—one of the leading causes of global disability. By analyzing randomized controlled trials from multiple countries, the study provides a comprehensive assessment of the current clinical evidence, emphasizing both the promise and limitations of creatine as an adjunct therapy for depressive symptoms.

Property	Value
Organization	University of Ottawa
Journal Name	Brain Medicine
Authors	Bassam Jeryous Fares, Nicholas Fabiano
Population	Participants with major depressive disorder and bipolar disorder
Sample Size	n=238
Methods	Systematic Review
Outcome	Depression symptoms and treatment response
Results	Two trials showed creatine benefits, three showed no improvement.

Literature Review: Related Studies

To better understand the context of this new review, we searched the Consensus database, which includes over 200 million research papers. The following search queries were used to identify relevant studies:

1. creatine depression treatment trials
2. creatine mental health outcomes
3. creatine efficacy in mood disorders

Below is a summary of key topics and findings from the related literature:

Topic	Key Findings
Does creatine enhance antidepressant efficacy in major depressive disorder?	- Creatine augmentation of SSRI treatment in women with MDD may accelerate and enhance antidepressant response, with significant improvements in depressive symptoms compared to placebo 1 2. - Some studies show improvements in brain energy metabolism correlating with clinical improvement in MDD, especially in female populations 2 3.
Is creatine effective in treatment-resistant or bipolar depression?	- In adolescent females with SSRI-resistant depression, creatine supplementation increased brain phosphocreatine levels, but clinical symptom improvement was inconsistent and not always superior to placebo 3. - Studies in bipolar depression are inconclusive: while some remission rates were higher with creatine adjunctive therapy, primary outcomes (overall symptom reduction) often did not reach statistical significance; safety concerns (hypomania/mania) were noted 4 5.
How might creatine impact brain health and psychiatric disorders?	- Reviews indicate creatine supplementation may benefit brain health, especially in contexts of energy deficits (e.g., neurodegenerative diseases, depression), but highlight that the role of creatine in psychiatric disorders is still not well established 6 7. - There is consistent evidence that creatine can increase brain creatine levels and may benefit cognitive processing, but optimal dosing and patient selection remain unclear 7 8.

Does creatine enhance antidepressant efficacy in major depressive disorder?

Several studies have investigated whether adding creatine to standard antidepressant therapy results in faster or more robust improvements in depressive symptoms, particularly in women with MDD. The majority of positive findings are in this subgroup, with creatine showing additive benefits when combined with selective serotonin reuptake inhibitors (SSRIs). The new systematic review confirms these trends but also notes variability across studies.

• Creatine augmentation led to faster and larger reductions in depression scores among women with MDD receiving SSRIs 1 2.
• Neuroimaging studies demonstrated improvements in brain metabolic markers (e.g., prefrontal N-acetylaspartate) with creatine supplementation, correlating with symptom improvement 2.
• Most evidence for efficacy comes from studies enrolling adult women, raising questions about generalizability 1 2 3.
• The new review's findings of benefit in two out of five trials, both in women with MDD, are consistent with these prior results 1 2.

Is creatine effective in treatment-resistant or bipolar depression?

Research evaluating creatine in more complex or refractory forms of depression—such as SSRI-resistant adolescent depression or bipolar depression—shows less consistent results. While some biochemical markers improve, clinical symptom benefits are less robust, and there are safety considerations in bipolar disorder.

• In adolescent females with SSRI-resistant depression, creatine increased brain phosphocreatine but did not reliably improve depression scores compared to placebo 3.
• Two randomized trials in bipolar depression found no significant improvement in primary outcomes, though higher remission rates were observed in some analyses 4.
• Safety is a concern: cases of hypomania or mania were reported in bipolar participants receiving creatine 4.
• The new systematic review reflects these findings, reporting no benefit in treatment-resistant or bipolar populations and highlighting similar safety concerns 3 4 5.

How might creatine impact brain health and psychiatric disorders?

Broader reviews suggest creatine’s potential extends beyond muscle metabolism, with possible roles in supporting brain energy homeostasis and neuroprotection. However, the clinical application in psychiatric disorders is still in early stages, and key questions remain about dosing, duration, and patient selection.

• Creatine may modulate brain energy metabolism, potentially supporting cognitive function and mitigating symptoms in conditions with brain energy deficits (e.g., depression, traumatic brain injury) 6 7 8.
• Human studies consistently show that brain creatine levels can be increased with supplementation, but optimal protocols for psychiatric indications are not established 7 8.
• The mechanistic rationale for creatine in depression involves both energy metabolism and potential modulation of neurotransmitter systems 6 7.
• The new study’s emphasis on the need for longer, larger, and more targeted trials echoes the recommendations of recent reviews 6 7 8.

Future Research Questions

Despite some encouraging results, current evidence is insufficient to recommend creatine as a standard adjunct for depression. Future research should address gaps in study populations, dosing, duration, and underlying mechanisms.

Research Question	Relevance
Does creatine augmentation improve depression outcomes equally in men and women?	Most studies showing benefit enrolled predominantly women, suggesting possible sex differences in response that need to be clarified in larger, mixed-gender trials 1 2 3.
What is the optimal dose and duration of creatine supplementation for treating depression?	Existing trials vary widely in dose (2–10 g/day) and duration (6–8 weeks), and it is unclear whether higher doses or longer supplementation yield greater benefits or increased risks 3 4 7.
Is creatine supplementation safe and effective in patients with bipolar disorder?	Reports of hypomania/mania in some bipolar patients highlight the need for careful safety monitoring and more targeted studies in this population 4 5.
Does combining creatine with exercise improve depression outcomes more than creatine alone?	Since creatine is often used as a sports supplement, and exercise itself has antidepressant effects, studies should determine whether combined interventions have additive or synergistic benefits 7 8.
What are the mechanisms by which creatine affects brain energy metabolism and mood?	Understanding the biological pathways—such as effects on ATP synthesis, neurotransmitter regulation, and neuroprotection—could inform patient selection and development of more targeted treatments 6 7.