While results were mixed across five randomized controlled trials, some women showed significant symptom reduction when creatine was paired with standard care.
Creatine is a popular sports supplement, widely used to improve strength and muscle performance, but the chemistry that fuels a bicep curl is nearly identical to what powers the brain. The brain is an expensive organ, burning energy at a rate out of all proportion to its size, and new evidence suggests that when this energy metabolism falters, mood may follow.
The recent review led by Bassam Jeryous Fares analyzed data from 238 participants across five countries, including the United States, South Korea, Brazil, Israel, and India. The findings create a complex map of efficacy: it works for some, fails for others, and potentially triggers risks for a specific subset of patients.
The Split Verdict: Where Creatine Worked and Where It Failed
The evidence is far from a consensus. The researchers found a stark divide in how different populations responded to the supplement. The strongest signal appeared in women with major depressive disorder. In one trial, women taking five grams of creatine daily alongside the antidepressant escitalopram saw greater improvements after eight weeks than those on a placebo. This improvement was considered large by conventional statistical standards, with a Cohen’s d of 1.13 on the Hamilton Depression Rating Scale.
Creatine also showed promise when paired with non-pharmacological interventions. One study found that participants receiving creatine alongside cognitive behavioral therapy (CBT) experienced a steeper drop in symptoms than those receiving therapy with a placebo.
However, the findings were not consistent. Three other trials yielded no meaningful benefit:
- Treatment-resistant depression: Creatine at five or ten grams daily did not outperform placebo in people who had already failed to respond to medication.
- Adolescents: Trials involving teen girls found no benefit across various dosages after eight weeks.
- Bipolar Disorder: A study on patients in a depressive episode found no significant improvement with six grams of creatine added to medication.
This inconsistency suggests that the evidence remains preliminary.
The Metabolic Link: Why the Brain Needs Gym Supplements
The logic is grounded in the brain’s enormous energy demands. Creatine helps cells rebuild adenosine triphosphate (ATP), the molecule that powers cells. Researchers believe that some people with depression may have alterations in brain energy metabolism, and creatine could help support these energy-producing pathways.
“Researchers believe that some people with depression may have alterations in brain energy metabolism, and creatine could help support these energy-producing pathways,”
Thea Gallagher, psychologist and director of wellness programs at NYU Langone
Beyond ATP, there is emerging evidence that creatine may influence neurotransmitters like dopamine and serotonin—the same targets as most antidepressants. However, the authors of the review were quick to caution that this link remains correlational, as depression has “many moving parts.”
Safety Warnings and the Bipolar Risk
For the general population, creatine monohydrate is generally viewed as safe, with side effects often limited to mild stomach pain. But for those with bipolar disorder, the stakes are higher.
In the trial involving bipolar depression, two participants taking creatine developed hypomania or mania, suggesting that creatine may affect people differently depending on their underlying condition.
This risk underscores the importance of caution. While a gym-goer might take creatine for muscle mass, a patient with a mood disorder faces a different biological landscape.
The Clinical Reality: Signal vs. Verdict
The researchers emphasized that the findings are not yet generalizable and that larger, well-controlled trials are still needed.
“Two trials pointed one way and three pointed another. That is not the kind of evidence on which you change clinical practice. It is the kind that tells you the question is worth further exploration.”
Bassam Jeryous Fares, student in the Faculty of Medicine at the University of Ottawa
The current state of the evidence can be summarized as follows:
| Population | Finding | Confidence Level |
|---|---|---|
| Women with MDD | Positive (when added to escitalopram/CBT) | Promising/Preliminary |
| Adolescent Girls | No Benefit | Low |
| Bipolar Disorder | No Benefit + Risk of Mania | Cautionary |
Until large-scale, standardized trials can determine exactly who benefits and who is at risk, creatine remains a promising adjunct, not a replacement. Always consult your healthcare provider before adding supplements to a psychiatric regimen.
