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Head-to-head evidence comparison — which supplement is right for you?
5-HTP vs Trazodone: 5-HTP 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.
5-HTP wins 3 of 3 categories. Both are solid choices — the best pick depends on your specific goals.
Verdict
Likely helps
6 of 7 studies with measurable effects showed benefit.
Top outcomes
Verdict
Mostly mechanism / observational
Top outcomes
Shared outcomes (1)
Outcomes where both 5-HTP and Trazodone have evidence — compare verdict strength side-by-side.
50-100mg for sleep; 150-300mg for mood
For sleep: 30-45 minutes before bed, For mood: 2-3 divided doses with meals
Capsules
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
Risk of serotonin syndrome — agitation, tremor, hyperreflexia, clonus, hyperthermia and autonomic instability. Serotonin syndrome has been reported with trazodone in combination with other serotonergic agents.
Do not combine without a prescriber directing it. If you take trazodone for sleep or depression, treat 5-HTP as contraindicated rather than complementary.
2-4 weeks
1-2 weeks
2-4 weeks
First 1-2 weeks
1-7 nights
Days to weeks
2 weeks
Morning after the first dose
Early pharmacological interventions for universal prevention of post-traumatic stress disorder (PTSD)
The Cochrane database of systematic reviews (2022) · Systematic review · n=2023
This review provides uncertain evidence only regarding the use of hydrocortisone, propranolol, dexamethasone, omega-3 fatty acids, gabapentin, paroxetine, PulmoCare formula, Oxepa formula, or 5-hydroxytryptophan as universal PTSD prevention strategies.
Combination pharmacotherapy for the treatment of fibromyalgia in adults
The Cochrane database of systematic reviews (2018) · Systematic review · n=1474
Two studies only reported any primary outcomes of interest (patient-reported pain relief of 30%, or 50%, or greater).
The Impact of 5-Hydroxytryptophan Supplementation on Cognitive Function and Mood in Singapore Older Adults: A Randomized Controlled Trial
Nutrients (2025) · Rct · n=30
Results: A significant time effect was observed in the MoCA score, which was mainly explained by a significant increase in the 5-HTP group (week 0 vs. week 12: 26.6 ± 1.4 a.u. vs. 27.6 ± 1.4 a.u., p < 0.05).
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
Limited evidence from small RCTs (n=30, n=166). Effectiveness constrained by mixed study populations and preliminary findings. Higher doses associated with increased nausea risk.
AI-estimated from published studies. Interpret as directional guidance.
5-HTP has a higher evidence score (5.5/10 vs 3.8/10) and wins in 3 of 3 categories.
For fall asleep faster, 5-HTP has a higher relevance score (70 vs 12).
Caution: Risk of serotonin syndrome — agitation, tremor, hyperreflexia, clonus, hyperthermia and autonomic instability. Serotonin syndrome has been reported with trazodone in combination with other serotonergic agents. Do not combine without a prescriber directing it. If you take trazodone for sleep or depression, treat 5-HTP as contraindicated rather than complementary. 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.