Creatine is best known as a gym supplement, but a new review looks at what it does for a struggling brain. Researchers pooled six articles from five randomized controlled trials testing creatine monohydrate (CrM) as an add-on treatment for mental disorders — 126 people on creatine compared with 112 on placebo, average age 36. Doses across the trials ranged from 2 to 10 grams per day, taken for 4 to 8 weeks alongside standard treatment, not instead of it.
The clearest result came from the largest trial in the review. Fifty-two women with major depressive disorder added either 5 grams of creatine daily or a placebo to the antidepressant escitalopram. The creatine group improved significantly more on depression rating scales, starting as early as week 2 and continuing through week 8 — a difference researchers rated as large (Cohen's d = 1.13). A separate trial combining creatine with cognitive behavioral therapy also outperformed CBT plus placebo.
But it didn't work for everyone. In female adolescents, adding creatine to antidepressant treatment made no measurable difference compared with placebo. The same was true for creatine as an add-on treatment in bipolar depression. The picture that emerges is narrower than "creatine helps depression" — the strongest evidence is specifically for adult women with major depressive disorder adding creatine to an SSRI or to therapy.
A safety signal worth flagging. In one trial, 2 of 17 participants on creatine developed hypomania or mania — a serious side effect, even though it was rare. This is a reminder that creatine is not risk-free for mental health use, particularly for anyone with a history of bipolar disorder, and any decision to try it alongside psychiatric medication belongs in a conversation with a prescriber, not a self-directed experiment.
What the review can and can't tell us. Two of the five trials were rated low risk of bias; the other three had some methodological concerns. Only major depressive disorder and bipolar depression were studied — no other mental health conditions were included, so claims about creatine and anxiety, ADHD, or other conditions go beyond what this evidence covers. The authors themselves call for larger, double-blind trials before drawing firm conclusions.
Bottom line. In adult women with major depressive disorder, adding 5 grams of creatine daily to an SSRI or to cognitive behavioral therapy outperformed placebo in the strongest trials reviewed here — but the same approach failed to help adolescents or people with bipolar depression, and carries a rare but real risk of triggering hypomania or mania. This is evidence for a conversation with a doctor about augmentation, not a case for taking creatine as a stand-alone treatment for depression.
Medical note. This article is for general education purposes only and is not intended as personal medical advice.