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Head-to-head evidence comparison — which supplement is right for you?
Trazodone vs Tryptophan: Tryptophan has the stronger overall evidence (5.5 vs 3.8/10); take care combining them — there's a flagged interaction. Take the 60-second quiz for a pick tailored to your goals.
Tryptophan wins 3 of 3 categories. Both are solid choices — the best pick depends on your specific goals.
Verdict
Mostly mechanism / observational
Top outcomes
Verdict
Likely helps
5 of 6 studies with measurable effects showed benefit.
Top outcomes
Shared outcomes (2)
Outcomes where both Trazodone and Tryptophan have evidence — compare verdict strength side-by-side.
Prescription only — a clinician sets the dose. The doses studied for sleep are low: the placebo-controlled trials that show anything used 50 mg at bedtime (30 min before bed in the primary-insomnia study; 10 PM in the Alzheimer's study), and the systematic-review literature treats <100 mg/day as the 'low-dose' insomnia range versus ≥100 mg/day as the antidepressant range. This is entirely OFF-LABEL. The approved indication is major depressive disorder, where outpatient dosing goes up to 400 mg/day in divided doses (up to 600 mg/day in monitored inpatients).
before-bed
Immediate-release oral tablet, prescribed and dose-titrated by a clinician
500-1000mg before bed
30-60 minutes before bed, On empty stomach or with carbohydrates
L-Tryptophan capsules
Risk of serotonin syndrome.
Do not combine without prescriber supervision.
1-7 nights
Days to weeks
2 weeks
Morning after the first dose
30-60 minutes
1-2 weeks
1-2 weeks
1-2 hours after dose
Clinical Practice Guideline for the Pharmacologic Treatment of Chronic Insomnia in Adults: An American Academy of Sleep Medicine Clinical Practice Guideline.
Journal of Clinical Sleep Medicine (2017) · Systematic review
The AASM commissioned a task force of four sleep-medicine experts, ran a systematic review of randomised controlled trials, and graded the evidence with GRADE
Trazodone for the treatment of insomnia: a meta-analysis of randomized placebo-controlled trials.
Sleep Medicine (2018) · Meta analysis
Seven randomised placebo-controlled trials involving only 429 patients in total — the entire dedicated meta-analytic base for trazodone in insomnia
Comparative effects of pharmacological interventions for the acute and long-term management of insomnia disorder in adults: a systematic review and network meta-analysis.
The Lancet (2022) · Meta analysis
170 trials (36 interventions, 47,950 participants) in the systematic review; 154 double-blind RCTs (30 interventions, 44,089 participants) in the network meta-analysis
The Tryptophan Catabolite or Kynurenine Pathway in a Major Depressive Episode with Melancholia, Psychotic Features and Suicidal Behaviors: A Systematic Review and Meta-Analysis
Cells (2022) · Meta analysis · n=4647
Severe patients showed significant lower (p < 0.0001) TRP (standardized mean difference, SMD = -0.517, 95% confidence interval, CI: -0.735; -0.299) and TRP/CAAs (SMD = -0.617, CI: -0.957; -0.277) levels with moderate effect sizes, while no significant difference in CAAs were found.
Comparative efficacy and tolerability of nutraceuticals for depressive disorder: A systematic review and network meta-analysis
Psychological medicine (2025) · Meta analysis · n=17437
Adjunctive nutraceuticals consistently showed better efficacy than antidepressants (ADT) alone in outcomes including SMD, remission, and response.
Differential Metabolites in Osteoarthritis: A Systematic Review and Meta-Analysis
Nutrients (2023) · Meta analysis · n=495
In the 13 studies, 132 kinds of small molecule differential metabolites were extracted, 58 increased, 57 decreased and 17 had direction conflicts.
Based on meta-analyses showing tryptophan's role in depression and serotonin pathways. Evidence comes from studies of tryptophan depletion and kynurenine pathway research rather than direct supplementation RCTs. Conservative effectiveness due to indirect evidence.
AI-estimated from published studies. Interpret as directional guidance.
Tryptophan has a higher evidence score (5.5/10 vs 3.8/10) and wins in 3 of 3 categories.
For fall asleep faster, Tryptophan has a higher relevance score (80 vs 12).
Caution: Risk of serotonin syndrome. Do not combine without prescriber supervision. Always consult a healthcare provider before combining these supplements.
The right pick depends on your goals. Answer a few quick questions for a personalised recommendation — or dig into the full evidence on each.