Head-to-head evidence comparison — which supplement is right for you?
GABA wins 1 of 3 categories. Both are solid choices — the best pick depends on your specific goals.
50-100mg for sleep; 150-300mg for mood
For sleep: 30-45 minutes before bed, For mood: 2-3 divided doses with meals
Capsules
250-750mg
30-60 minutes before desired effect, Before bed for sleep, Before stressful events for anxiety
Capsules or powder
2-4 weeks
1-2 weeks
2-4 weeks
First 1-2 weeks
30-60 minutes
30-60 minutes
30-60 minutes
Efficacy of a postbiotic and its components in promoting colonic transit and alleviating chronic constipation in humans and mice
Cell reports. Medicine (2025) · Animal · n=110
A randomized, double-blind, placebo-controlled crossover trial involving 110 adults with chronic constipation (Rome IV criteria) demonstrates that a 3-week Probio-Eco intervention significantly improves constipation symptoms, stool straining, and worry scores.
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).
Gamma aminobutyric acid (GABA) receptor agonists for acute stroke
The Cochrane database of systematic reviews (2018) · Meta analysis · n=3838
The most frequent adverse events related to chlormethiazole were somnolence (RR 4.56, 95% CI 3.50 to 5.95; two trials; 2527 participants; moderate-quality evidence) and rhinitis (RR 4.75, 95% CI 2.67 to 8.46; two trials; 2527 participants; moderate-quality evidence).
GABA Analogue HSK16149 in Chinese Patients With Diabetic Peripheral Neuropathic Pain: A Phase 3 Randomized Clinical Trial
JAMA network open (2024) · Rct · n=393
Of 725 randomized patients in the full-analysis set (393 men [54.2%]; mean [SD] age, 58.80 [9.53] years; 700 [96.6%] of Han Chinese ethnicity), 177 received placebo; 178, HSK16149, 40 mg/d; 179, HSK16149, 80 mg/d; 66, HSK16149, 120 mg/d; 63, HSK16149, 160 mg/d; and 62, pregabalin, 300 mg/d.
Neurometabolite differences in Autism as assessed with Magnetic Resonance Spectroscopy: A systematic review and meta-analysis
Neuroscience and biobehavioral reviews (2024) · Meta analysis
Data were extracted and grouped by metabolite, brain region and several other factors before calculation of standardised effect sizes.
GABA has a higher evidence score (8.5/10 vs 8.5/10) and wins in 1 of 3 categories.
For reduce anxiety & stress, GABA has a higher relevance score (75 vs 60).
No known interactions between 5-HTP and GABA have been documented in our database. However, always consult a healthcare provider before combining supplements.