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Head-to-head evidence comparison — which supplement is right for you?
5-HTP vs GABA: 5-HTP has the stronger overall evidence (5.5 vs 4/10); they're alternatives for reduce anxiety & stress — the best pick depends on your goals. Take the 60-second quiz for a pick tailored to your goals.
5-HTP wins 2 of 3 categories. Both are solid choices — the best pick depends on your specific goals.
Verdict
Too few graded studies
0 of 1 studies with measurable effects showed benefit.
Top outcomes
Verdict
Too few graded studies
Top outcomes
Shared outcomes (2)
Outcomes where both 5-HTP and GABA have evidence — compare verdict strength side-by-side.
50-100mg for sleep; 150-300mg for mood (a typical label dose. The cited 100-300 mg study tested tolerability in 15 healthy men also given carbidopa, not mood)
For sleep: 30-45 minutes before bed, For mood: 2-3 divided doses with meals
Capsules
250-300 mg (the one cited trial that states its dose used 300 mg a day). Label ranges go up to 750 mg, above that dose.
30-60 minutes before desired effect, Before bed for sleep, Before stressful events for anxiety
Capsules or powder
and 6 more not shown
2-4 weeks
1-2 weeks
2-4 weeks
First 1-2 weeks
30-60 minutes
30-60 minutes
30-60 minutes
Early pharmacological interventions for universal prevention of post-traumatic stress disorder (PTSD)
The Cochrane database of systematic reviews (2022) · Systematic review · n=2023
Cochrane review of 13 randomised trials in 2,023 adults exposed to a traumatic event, testing eight drug or nutritional interventions for universal PTSD prevention, 5-hydroxytryptophan among them.
Combination pharmacotherapy for the treatment of fibromyalgia in adults
The Cochrane database of systematic reviews (2018) · Systematic review · n=1474
Cochrane review of 16 trials in 1,474 adults with fibromyalgia testing combinations of drugs, one of which combined a monoamine oxidase inhibitor with 5-hydroxytryptophan in 200 participants.
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).
Herbal Remedies and Their Possible Effect on the GABAergic System and Sleep
Nutrients (2021) · Systematic review
A systematic analysis of studies on how various herbal medicines act on GABA receptor subtypes in the context of sleep. It reviews mechanisms, not trials of GABA supplements.
Effect of Probiotics on the Symptomatology of Autism Spectrum Disorder and/or Attention Deficit/Hyperactivity Disorder in Children and Adolescents: Pilot Study
Research on child and adolescent psychopathology (2025) · Rct · n=80
80 children aged 5 to 16 with ADHD (38) or autism (42) took a probiotic (Lactiplantibacillus plantarum and Levilactobacillus brevis, strains linked to dopamine and GABA production) or placebo for 12 weeks. No GABA was given.
GABA Supplementation, Increased Heart-Rate Variability, Emotional Response, Sleep Efficiency and Reduced Depression in Sedentary Overweight Women Undergoing Physical Exercise: Placebo-Controlled, Randomized Clinical Trial
Journal of dietary supplements (2024) · Rct · n=30
30 sedentary women with overweight or obesity doing physical exercise took GABA 200 mg or placebo once daily for 90 days.
5-HTP has a higher evidence score (5.5/10 vs 4/10) and wins in 2 of 3 categories.
For reduce anxiety & stress, GABA has a higher relevance score (75 vs 60).
No documented interaction was found in the data searched. This does not establish that this exact combination is safe.
Saffron, EPA omega-3, SAMe have real adjunct evidence — but these aren’t a substitute for care, and some interact dangerously.
Ashwagandha, L-theanine, magnesium, saffron — what actually helps stress, and the safety caveats.
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.