NSTK · 01.2026Independent supplement reference
NutriStack
Edition 1.0Updated August 1, 2026

Supplement × Prescription·Evidence index

L-Tryptophan and Trazodone: what the published research says

PubMed indexes 6 records that name L-Tryptophan and Trazodone together, either in the title or in an interaction, co-administration, or pharmacokinetic context. Each one is listed below with its study design and, where the abstract states one, the authors’ own conclusion, quoted and linked. This page reports that literature. It does not tell you whether to combine them.

Read this first

An evidence index, not guidance.

Every statement below is attributed to a named, dated, linked source.

This page lists published research relevant to L-Tryptophan and Trazodone. It deliberately does not state whether the combination is safe, whether it interacts, in which direction, at what dose, or how far apart to take them.

The research

6 studies naming L-Tryptophan and Trazodone.

Strongest relevance first: papers naming both substances in the title, then human trials and systematic reviews.

The effects of trazodone with L-tryptophan on sleep-disordered breathing in the English bulldog.

American journal of respiratory and critical care medicine · 1999 · PMID 10556137

Animal study

“Trazodone/ L-tryptophan dose-dependently reduced sleep fragmentation, p = 0.03, increased sleep efficiency, p = 0.005, enhanced slow-wave sleep, p = 0.0004, and minimized sleep-related suppression of upper airway dilator activity, p < 0.02. Trazodone with L-tryptophan can treat sleep-disordered breathing (SDB) in an animal model of OSAHS; the effectiveness of this therapy may be related to increased upper airway dilator activity in sleep and/or enhanced slow-wave sleep.”

Veasey et al. · From the abstract

Names both L-Tryptophan and Trazodone in its title.

A pilot study of combined trazodone and tryptophan in obsessive-compulsive disorder.

International clinical psychopharmacology · 1986 · PMID 3571943

Human subjects

“An open pilot trial of combined trazodone and tryptophan for 11 patients with Obsessive-Compulsive Disorder was conducted to test the hypothesis that increasing serotonin activity is therapeutic for this condition. Results were not encouraging; several patients tolerated the combination poorly, but even among patients completing 2 weeks' treatment benefit was marginal.”

Mattes · From the abstract

Names both L-Tryptophan and Trazodone in its title.

Limitations

What this evidence cannot tell you.

Search-based evidence indexes have real limits, and it is worth being explicit about them:

NutriStack

Track what you actually take.

NutriStack is a free iPhone app for organising a supplement routine: what you take, when, and what the published record says about it. Its exploratory interaction checker covers L-Tryptophan, Trazodone, and several hundred other substances.

The checker is a research and organisation tool, not a clinical decision aid, and its per-pair assessments are excluded from search until they pass claim-level review.

NutriStack is an informational and organizational tool, not a medical service, and not a substitute for professional advice. Always consult a qualified healthcare professional before starting, stopping, or changing any supplement or medication.