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Related Experiment Videos

Tryptophan and 5-hydroxytryptophan for depression.

K Shaw1, J Turner, C Del Mar

  • 1Department of Psychiatry, University of Oxford, Warneford Hospital, Oxford, Oxon, UK, OX3 7JX.

The Cochrane Database of Systematic Reviews
|November 1, 2001
PubMed
Summary

5-Hydroxytryptophan (5-HTP) and tryptophan show potential for alleviating depression compared to placebo. However, limited high-quality evidence necessitates further research into their efficacy and safety for treating depressive disorders.

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Area of Science:

  • Neuroscience and Psychiatry
  • Pharmacology and Therapeutics
  • Evidence-Based Medicine

Background:

  • 5-Hydroxytryptophan (5-HTP) and tryptophan are explored as natural alternatives to conventional antidepressants.
  • These substances are commonly used for managing unipolar depression and dysthymia.

Purpose of the Study:

  • To evaluate the effectiveness of 5-HTP and tryptophan against placebo in treating adult depressive disorders.
  • To assess the safety profile of 5-HTP and tryptophan for treating depression.

Main Methods:

  • A comprehensive literature search was conducted across multiple databases and through manual searching.
  • Included studies were randomized controlled trials comparing 5-HTP or tryptophan with placebo in adults with depression.
  • Data extraction and quality assessment were performed independently by reviewers, with combined analysis for 5-HTP and tryptophan due to limited trials.

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Main Results:

  • Only two high-quality trials met the inclusion criteria, involving 64 patients.
  • Preliminary evidence suggests 5-HTP and tryptophan are more effective than placebo in alleviating depressive symptoms.
  • The quality of the available evidence is insufficient to draw definitive conclusions.

Conclusions:

  • Despite a large number of studies identified, few meet rigorous quality standards for reliability.
  • Current evidence indicates a potential benefit of 5-HTP and tryptophan over placebo for depression.
  • Further rigorous research is essential to confirm efficacy and safety, especially considering the risk of Eosinophilia-Myalgia Syndrome and the availability of established antidepressants.