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Head-to-head evidence comparison — which supplement is right for you?
5-HTP vs Melatonin: Melatonin has the stronger overall evidence (8.5 vs 5.5/10); they're alternatives for fix sleep schedule / jet lag — the best pick depends on your goals. Take the 60-second quiz for a pick tailored to your goals.
Melatonin 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
Likely helps
19 of 24 studies with measurable effects showed benefit.
Top outcomes
Shared outcomes (1)
Outcomes where both 5-HTP and Melatonin 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
0.5-1mg
30-60 minutes before bed
Immediate-release tablet or sublingual
Commonly combined for sleep with no meaningful direct interaction. There is no direct serotonin-syndrome risk from this pair — the only caution comes from 5-HTP itself, which raises serotonin.
Generally fine to combine for sleep. The real caution is 5-HTP with serotonergic medications (SSRIs/SNRIs/MAOIs), not with melatonin — do not stack 5-HTP with those drugs regardless.
2-4 weeks
1-2 weeks
2-4 weeks
First 1-2 weeks
Same night
1-3 days
Next morning
First week
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).
Melatonin in cancer treatment
The Cochrane database of systematic reviews (2025) · Meta analysis · n=126
We downgraded the certainty of the evidence because of high risk of bias, small sample size, the width of the 95% confidence interval, and indirectness due to inadequate reporting of cancer type.
Comparative Efficacy, Tolerability, and Acceptability of Donanemab, Lecanemab, Aducanumab, Melatonin, and Aerobic Exercise for a Short Time on Cognitive Function in Mild Cognitive Impairment and Mild Alzheimer's Disease: A Systematic Review and Network Meta-Analysis
Journal of Alzheimer's disease : JAD (2024) · Meta analysis · n=4599
Melatonin may be a better potential disease-modifying treatment for cognitive decline in mild AD and MCI.
Melatonin for sleep disorders in people with autism: Systematic review and meta-analysis
Progress in neuro-psychopharmacology & biological psychiatry (2023) · Meta analysis · n=595
According to the global analysis, the wake after sleep onset and night awakening parameters were not statistically significant.
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.
Based on meta-analyses showing 7-12 minute reduction in sleep onset. Higher doses showed diminishing returns and increased morning grogginess. Sublingual forms may be more effective at lower doses.
AI-estimated from published studies. Interpret as directional guidance.
Melatonin has a higher evidence score (8.5/10 vs 5.5/10) and wins in 3 of 3 categories.
For fix sleep schedule / jet lag, Melatonin has a higher relevance score (98 vs 60).
Commonly combined for sleep with no meaningful direct interaction. There is no direct serotonin-syndrome risk from this pair — the only caution comes from 5-HTP itself, which raises serotonin. Generally fine to combine for sleep. The real caution is 5-HTP with serotonergic medications (SSRIs/SNRIs/MAOIs), not with melatonin — do not stack 5-HTP with those drugs regardless. Consult a healthcare provider for personalized advice.
Saffron, EPA omega-3, SAMe have real adjunct evidence — but these aren’t a substitute for care, and some interact dangerously.
The honest tier list — proven staples vs situational vs mostly marketing. The hub the other guides feed into.
When to take what, with or without food, and which supplements compete vs pair well.
Melatonin, magnesium, glycine, L-theanine — tiered by evidence, plus a wind-down timeline.
The right pick depends on your goals. Answer a few quick questions for a personalised recommendation — or dig into the full evidence on each.