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the claim

Depression is caused by a chemical imbalance or serotonin deficiency in the brain.

the verdict
REFUTED
the evidence says no
Recorded sources
3 sources for · 4 against

Counts group repeated records of the same source within each side. They do not measure evidence strength or source independence.

Is it true that depression is caused by a chemical imbalance or serotonin deficiency in the brain?

No. Multiple authoritative sources state the serotonin/chemical imbalance theory of depression is not supported by scientific evidence, including a reference work and a 2022 literature review. A few sources assert serotonin deficiency plays a role in depression, but these are hedged or describe the hypothesis historically.

Verdict: REFUTED · 3 sources for, 4 against · Last checked

The private library was unavailable for some searches in this check. Missing library results are not evidence against the claim.

Evidence for · 3
Brain Serotonin Deficiency
2016
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García-Cazorla, A. & Artuch, R. (2016). Brain Serotonin Deficiency. doi.org. https://doi.org/10.1093/med/9780199972135.003.0032

Evidence against · 4
Biology of depression
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Biology of depression. (n.d.). en.wikipedia.org. https://en.wikipedia.org/wiki/Biology_of_depression

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More for · 2
Treating Depression and other Serotonin Deficiency Brain Disorders with Tryptophan
2022
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Haleem, D. J. (2022). Treating Depression and other Serotonin Deficiency Brain Disorders with
Tryptophan. doi.org. https://doi.org/10.2174/2211556010666211202104548

Neuroplasticity — A New Approach to the Pathophysiology of Depression
2011
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Neuroplasticity — A New Approach to the Pathophysiology of Depression. (2011). doi.org. https://doi.org/10.1007/978-1-908517-18-0_1

More against · 3
Is the chemical imbalance an ‘urban legend’? An exploration of the status of the serotonin theory of depression in the scientific literature
2022
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Is the chemical imbalance an ‘urban legend’? An exploration of the status of the serotonin theory of depression in the scientific literature. (2022). doi.org. https://doi.org/10.1016/j.ssmmh.2022.100098

Pathological stratification and therapeutic implications for post-stroke depression based on a multidimensional biomarker panel: a narrative review.
2026
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X, J., Y, F., Y, C., C, L., & G, L. (2026). Pathological stratification and therapeutic implications for post-stroke depression based on a multidimensional biomarker panel: a narrative review.. doi.org. https://doi.org/10.3389/fneur.2026.1810716

Rethinking Depression—Beyond Neurotransmitters: An Integrated Psychoneuroendocrineimmunology Framework for Depression’s Pathophysiology and Tailored Treatment -
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Rethinking Depression—Beyond Neurotransmitters: An Integrated Psychoneuroendocrineimmunology Framework for Depression’s Pathophysiology and Tailored Treatment - PMC Lock. (n.d.). pmc.ncbi.nlm.nih.gov. https://doi.org/10.3390/ijms26062759

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