Supplement reference
5-HTP
A sourced reference on 5-HTP identity, evidence limits and safety context.
Source and review status
Published sources checked
Sources checked on: 6 September 2026
Qualified clinical review: Pending. This page has not been clinically reviewed.
About this source check
AI-assisted editorial source checking covers the cited material and its stated limits. It is not a systematic review, verification of a supplied product, or clinical sign-off.
Editorial role: InfoAddict. Last material change: 6 September 2026. Next source review: 6 March 2027.
What it is
5-HTP is an immediate precursor in serotonin biosynthesis. That biochemical role does not diagnose a serotonin disorder or establish a treatment need.
Sources: National Library of Medicine, PubMed
What the cited evidence shows
A 2020 systematic review and meta-analysis included 13 investigations, with seven in its meta-analysis of people with depression. It reported substantial heterogeneity and generally weak study methods, including few placebo groups. The review calls for better placebo-controlled trials and does not establish routine treatment.
Sources: National Library of Medicine, PubMed
Limits and safety context
The cited review does not provide an interaction protocol or a personal use recommendation. People taking psychiatric medicines or considering a change to depression treatment should discuss it with a prescribing clinician or pharmacist.
Sources: National Library of Medicine, PubMed
Published sources
- Effects of 5-hydroxytryptophan on distinct types of depression: a systematic review and meta-analysis
National Library of Medicine, PubMed. 2020; accessed 6 September 2026.
Supports: Human depression studies: heterogeneous and generally weak; does not establish treatment.
Change history
| Date | Change | Clinical-review status |
|---|---|---|
| 6 September 2026 | Source-linked reference published | Pending |
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