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Head-to-head evidence comparison — which supplement is right for you?
5-HTP vs SAMe: SAMe has the stronger overall evidence (7 vs 5.5/10); take care combining them — there's a flagged interaction. Take the 60-second quiz for a pick tailored to your goals.
SAMe wins 2 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
Mixed evidence
1 of 3 studies with measurable effects showed benefit.
Top outcomes
Shared outcomes (2)
Outcomes where both 5-HTP and SAMe 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
400-1600mg for mood; 600-1200mg for joints
On empty stomach, Morning and/or midday
Enteric-coated tablets (SAMe tosylate or butanedisulfonate)
and 6 more not shown
and 2 more not shown
Additive serotonergic load, and with it a risk of serotonin syndrome: agitation, shivering, tremor, twitching muscles, sweating, a fast heartbeat and, at the severe end, fever and rigidity. This specific pair has not been studied; the risk is inferred from what each does alone and from how the same table already grades each against prescription serotonergics.
Do not stack them. If both are being considered for mood, pick one and give it a fair trial. Seek urgent medical help for agitation, shivering, twitching, a racing heart, sweating or fever. Anyone already on an antidepressant should not be taking either without their prescriber.
2-4 weeks
1-2 weeks
2-4 weeks
First 1-2 weeks
2-6 weeks
4-8 weeks
4-8 weeks
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).
S-Adenosylmethionine for osteoarthritis of the knee or hip
The Cochrane database of systematic reviews (2009) · Meta analysis · n=656
For pain, the analysis indicated a small SMD of -0.17 (95% CI -0.34 to 0.01), corresponding to a difference in pain scores between SAMe and placebo of 0.4 cm on a 10 cm VAS, with no between trial heterogeneity (I(2) = 0).
Efficacy of Pharmacological Interventions in Milder Depression: A Systematic Review and Meta-Analysis
Neuropsychopharmacology reports (2025) · Meta analysis · n=1049
A meta-analysis found no significant difference in response rates between the two treatments (risk ratio [RR] = 0.96, 95% CI: 0.78-1.18) or dropout rates (RR = 1.08, 95% CI: 0.62-1.88).
S-Adenosylmethionine (SAMe) for Liver Health: A Systematic Review
Nutrients (2024) · Systematic review · n=15
The most common doses were SAMe 1000 mg or 1200 mg per day with or without another treatment or natural supplement.
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.
Meta-analysis of 656 patients showed small effect size (SMD -0.17) corresponding to only 0.4cm improvement on 10cm pain scale. Effect is modest and barely reaches statistical significance threshold.
AI-estimated from published studies. Interpret as directional guidance.
SAMe has a higher evidence score (7/10 vs 5.5/10) and wins in 2 of 3 categories.
For support mood, SAMe has a higher relevance score (90 vs 75).
Caution: Additive serotonergic load, and with it a risk of serotonin syndrome: agitation, shivering, tremor, twitching muscles, sweating, a fast heartbeat and, at the severe end, fever and rigidity. This specific pair has not been studied; the risk is inferred from what each does alone and from how the same table already grades each against prescription serotonergics. Do not stack them. If both are being considered for mood, pick one and give it a fair trial. Seek urgent medical help for agitation, shivering, twitching, a racing heart, sweating or fever. Anyone already on an antidepressant should not be taking either without their prescriber. 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.