HormonesMelatonin

Exogenous melatonin enhances GABA activity, promoting non-REM sleep and reducing stress-related hyperarousal.

This scoping review of 58 studies found that exogenous melatonin enhances GABAergic activity through different mechanisms, promoting non-REM sleep and reducing stress-related hyperarousal. The review identified 20 studies on the GABAergic system supporting this effect.

Last updated: Aug 26, 2026•0 RCTs•📖 Read as article →

Evidence Score

Evidence Score32/100
Human RCT☆☆☆☆☆
Meta-analysis☆☆☆☆☆
Mechanism★★★★★
Safety★★★★☆
Confidencelow

Study Evidence

Study 1. Exogenous Melatonin as a Sleep-promoting Agent beyond its Chronobiotic Properties: A Scoping Review of its Effects on Key Sleep-wake Neurotransmitters.

observational

Biso L, Bragazzi NL, Bonaso M, Bersanetti E, Garbarino S, Scarselli M · Current neuropharmacology (2026)

Participants: N/A
Duration: N/A
Intervention: Exogenous melatonin (exo-MLT) administration
Outcome: GABA activity, non-REM sleep promotion, stress-related hyperarousal reduction
Effect Size: N/A
Population: Subjects from 58 original research papers (human and animal studies) on sleep and neuropsychiatric conditions

Result:

PubMed: 40698692DOI: 10.2174/011570159X379708250702084616

Mechanism Graph

Exogenous melatonin binds to melatonin receptors in the brain
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Modulates GABAergic neurotransmission through receptor interactions
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Enhances GABA activity via different mechanisms
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Promotes non-REM sleep and reduces stress-related hyperarousal

Limitations

  • ⚠Scoping review design does not provide quantitative meta-analysis or pooled effect sizes
  • ⚠Inconclusive findings for some neurotransmitter systems (adenosine, glycine) and no data on histamine and galanin

Frequently Asked Questions

How does exogenous melatonin affect GABA activity?▼

Exogenous melatonin enhances GABA activity through different mechanisms, promoting non-REM sleep and reducing stress-related hyperarousal, as shown in 20 studies reviewed.

Is exogenous melatonin effective for sleep disorders beyond circadian regulation?▼

Yes, this review underscores exo-MLT's mechanisms beyond circadian regulation, offering therapeutic promise in sleep disorders associated with other neuropsychiatric conditions.

What neurotransmitter systems were studied in this review?▼

The review analyzed effects on GABA, serotonin, dopamine, glutamate, norepinephrine, orexin, acetylcholine, adenosine, glycine, galanin, and histamine.

Does exogenous melatonin alter dopamine levels?▼

Thirteen studies suggested that exogenous melatonin does not alter physiological dopamine turnover but restores dopaminergic balance in pathological states.

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References

  1. 1.Biso L, Bragazzi NL, Bonaso M, Bersanetti E, Garbarino S, Scarselli M. "Exogenous Melatonin as a Sleep-promoting Agent beyond its Chronobiotic Properties: A Scoping Review of its Effects on Key Sleep-wake Neurotransmitters.." Current neuropharmacology, 2026. PMID: 40698692 DOI: 10.2174/011570159X379708250702084616
Disclaimer: This content is for educational purposes only and is not medical advice. Evidence scores reflect the quality and quantity of available research, not clinical recommendations. Always consult a healthcare professional before starting any supplement or intervention.