Creatine may help fight depression in some patients, according to a new systematic review that pooled data from five randomized clinical trials — though the evidence remains too mixed and too limited to support using the popular supplement as a standard treatment.
The review, published in the journal Brain Medicine, examined whether creatine — best known for building muscle — could also support the brain's energy supply in ways that ease depressive symptoms. Researchers found real signals of benefit in some trials, but no effect at all in others.
What the new review on creatine and depression found
Rather than running a new experiment, a team led by Bassam Jeryous Fares of the University of Ottawa analyzed existing research, identifying six published reports covering five randomized controlled trials in which participants unknowingly received either creatine or a placebo.
The trials, conducted in South Korea, the United States, Brazil, Israel, and India, together enrolled 238 participants — 126 given creatine and 112 given a placebo. Participants averaged 36 years old, and most were women; two trials enrolled only women. Four trials focused on major depressive disorder, while one involved people with bipolar disorder experiencing a depressive episode. Because study designs varied so much, researchers evaluated each trial individually rather than combining the results into a single statistic.
Where creatine showed promise, and where it didn't
Two of the five trials, both involving women with major depressive disorder, reported meaningful benefits. In one, participants taking five grams of creatine daily alongside the antidepressant escitalopram saw significantly greater symptom improvement after eight weeks than those on escitalopram plus a placebo, with more patients reaching remission. Another trial paired creatine with cognitive behavioral therapy and found a bigger drop in depression scores than therapy paired with a placebo.
The remaining three trials found no meaningful benefit. One showed no improvement from five or ten grams of daily creatine in patients whose depression hadn't responded to medication. Another found no advantage in adolescent girls at any tested dose. A third, involving people with bipolar disorder, also showed no benefit — and raised a safety flag, since two participants who took creatine developed hypomania or mania, suggesting the supplement may affect people differently depending on their underlying condition.
Why scientists think creatine could affect mood
The theory linking creatine to depression centers on the brain's heavy energy demands. Creatine is best known for helping muscles regenerate adenosine triphosphate, the molecule that powers cells, but the brain relies on the same energy system. Prior research has found altered creatine metabolism in people with mood disorders, prompting scientists to ask whether cellular energy problems contribute to depression. Creatine may also interact with dopamine and serotonin, neurotransmitters that regulate mood and are targeted by many standard antidepressants.
Even so, the review's authors stress these links remain theoretical. "The signal is interesting, but it is not a verdict," said Fares. "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." Nicholas Fabiano, the review's corresponding author and a psychiatry resident at the University of Ottawa, added that creatine appears safe — the only adverse events were mild gastrointestinal discomfort — but said it's too soon to say whether it reliably eases depression for a broad population.
What comes next for creatine depression research
The researchers say the current evidence is too limited for routine clinical use. The trials were small, skewed heavily toward women, and varied in methodological quality — two were judged low risk of bias, while the other three raised concerns around participant assignment and missing data. The review calls for larger trials lasting longer than eight weeks, along with studies that combine creatine with exercise and test whether different doses change outcomes, since higher doses may not necessarily help more. Animal studies showing that creatine affects depression-like behavior differently in male and female rodents could help explain why the strongest human results came from all-female trial groups. For now, readers following mental health and nutrition research should treat creatine as a promising lead rather than a proven depression treatment, alongside other emerging findings in brain science this year.
Frequently asked questions
Is creatine an approved treatment for depression?
No. Creatine is not an approved or standard depression treatment. Current evidence is mixed, and researchers say larger, longer trials are needed before it could be recommended.
Is creatine safe to take for mood support?
The reviewed trials found creatine generally safe, with mild gastrointestinal discomfort as the main side effect, though two participants with bipolar disorder developed hypomania or mania, suggesting caution for people with that condition.
