GABA
Amino Acid ·Exploratory record · not publication-reviewed ·Updated July 13, 2026
Primary inhibitory neurotransmitter supplement for relaxation and sleep.
Exploratory record, not a reviewed medical publication.
See the editorial and medical-review policies for the publication gate.
This generated database record has not completed a claim-level review by a qualified human medical reviewer. Bibliography links and evidence labels are not approval. The page remains available for reference and is excluded from search indexing.
What the research says.
A quick, data-only summary. The full evidence, dosing, and sources are below.
GABA is an amino acid most often used for relaxation, sleep support, anxiety reduction. NutriStack rates the overall evidence as emerging. A typical adult dose is 250-750 mg daily, commonly taken as pharmagaba (naturally fermented, preferred). This profile indexes 18 sources.
The bottom line
Evidence rating emerging. Most-documented uses: relaxation, sleep support, anxiety reduction. 18 sources indexed (2006–2025), with 0 interaction records on file.
How it works, mechanistically.
Core mechanism
Oral GABA may act peripherally on enteric nervous system and via limited BBB crossing. Activates GABA-A and GABA-B receptors to promote neuronal inhibition and relaxation.15,2
Dosing & protocol.
What it actually costs.
Real-world pricing across three quality tiers. Assumes PharmaGABA / GABA.
Assumes 250-750 mg/day. Vendor basis: NOW/iHerb, Vitacost, Thorne, and Amazon marketplace; PharmaGABA branded material sets premium pricing. Updated 2026-05-28.
The same dose, as food.
How much you'd eat to match a supplemental dose.
Food GABA levels rarely map cleanly to supplement dosing.
Full safety detail.
Side effects
- Drowsiness
- Tingling
- Shortness of breath (rare)
Contraindications
- Pregnancy
- Concurrent sedative use
Sources, by evidence tier.
Numbered references. Citations throughout the page link here.
Meta-analyses & systematic reviews
2- 1Meta-Analysis of Randomized Controlled Trials on Gamma-Aminobutyric Acid Analogues and Opioid-Based Therapies for CKD-Associated PruritusPMIDWathanavasin W, Thammathiwat T, Susantitaphong P · Kidney international reports · 2025
Wathanavasin W, Thammathiwat T, Susantitaphong P. Meta-Analysis of Randomized Controlled Trials on Gamma-Aminobutyric Acid Analogues and Opioid-Based Therapies for CKD-Associated Pruritus. Kidney international reports. 2025
- 2Neurofunctional correlates of glutamate and GABA imbalance in psychosis: A systematic reviewPMIDZahid U, Onwordi EC, Hedges EP et al. · Neuroscience and biobehavioral reviews · 2023
Zahid U, Onwordi EC, Hedges EP et al.. Neurofunctional correlates of glutamate and GABA imbalance in psychosis: A systematic review. Neuroscience and biobehavioral reviews. 2023
Randomized controlled trials
8- 3GABA Supplementation, Increased Heart-Rate Variability, Emotional Response, Sleep Efficiency and Reduced Depression in Sedentary Overweight Women Undergoing Physical Exercise: Placebo-Controlled, Randomized Clinical TrialPMIDGuimarães AP, Seidel H, Pires LVM et al. · Journal of Dietary Supplements · 2024
Oral GABA supplementation increased heart rate variability, improved emotional response, increased sleep efficiency, and reduced depression scores in sedentary overweight women undergoing exercise training.
- 4GABA Analogue HSK16149 in Chinese Patients With Diabetic Peripheral Neuropathic Pain: A Phase 3 Randomized Clinical TrialPMIDGuo X, Zhang T, Yuan G et al. · JAMA network open · 2024
Guo X, Zhang T, Yuan G et al.. GABA Analogue HSK16149 in Chinese Patients With Diabetic Peripheral Neuropathic Pain: A Phase 3 Randomized Clinical Trial. JAMA network open. 2024
- 5Efficacy of Food Supplement Based on Monacolins, γ-Oryzanol, and γ-Aminobutyric Acid in Mild Dyslipidemia: A Randomized, Double-Blind, Parallel-Armed, Placebo-Controlled Clinical TrialPMIDDe Lellis LF, Morone MV, Buccato DG et al. · Nutrients · 2024
De Lellis LF, Morone MV, Buccato DG et al.. Efficacy of Food Supplement Based on Monacolins, γ-Oryzanol, and γ-Aminobutyric Acid in Mild Dyslipidemia: A Randomized, Double-Blind, Parallel-Armed, Placebo-Controlled Clinical Trial. Nutrients. 2024
- 6Efficacy and Safety of Low-Dose Gamma-Aminobutyric Acid From Unpolished Rice Germ as a Health Functional Food for Promoting Sleep: A Randomized, Double-Blind, Placebo-Controlled TrialSource linkedPMIDYoon S, Byun JI, Shin WC et al. · Journal of Clinical Neurology · 2022
- 7Safety and Efficacy of Gamma-Aminobutyric Acid from Fermented Rice Germ in Patients with Insomnia Symptoms: A Randomized, Double-Blind TrialPMIDByun JI et al. · Journal of Clinical Neurology · 2018
Biosynthetic GABA from fermented rice germ improved sleep latency and quality in patients with insomnia symptoms with a good safety profile.
- 8Effect of oral gamma-aminobutyric acid (GABA) administration on sleep and its absorption in humansPMIDYamatsu A et al. · Food Science and Biotechnology · 2016
GABA shortened sleep latency by 5.3 minutes and increased total non-REM sleep time in healthy subjects.
- 9Growth hormone isoform responses to GABA ingestion at rest and after exercisePMIDPowers ME et al. · Medicine and Science in Sports and Exercise · 2008
GABA ingestion elevated both immunoreactive and immunofunctional growth hormone at rest and after exercise compared to placebo.
- 10Relaxation and immunity enhancement effects of gamma-aminobutyric acid (GABA) administration in humansPMIDAbdou AM et al. · BioFactors · 2006
After 60 minutes of GABA administration, it significantly increased alpha waves and decreased beta waves, indicating relaxation and reduced anxiety.
Reviews & position papers
6- 11The Role of GABA Receptors in Anesthesia and Sedation: An Updated ReviewPMIDPhilip AB, Brohan J, Goudra B · CNS drugs · 2025
Philip AB, Brohan J, Goudra B. The Role of GABA Receptors in Anesthesia and Sedation: An Updated Review. CNS drugs. 2025
- 12Milestone review: GABA, from chemistry, conformations, ionotropic receptors, modulators, epilepsy, flavonoids, and stress to neuro-nutraceuticalsPMIDJohnston GAR, Beart PM · Journal of neurochemistry · 2024
Johnston GAR, Beart PM. Milestone review: GABA, from chemistry, conformations, ionotropic receptors, modulators, epilepsy, flavonoids, and stress to neuro-nutraceuticals. Journal of neurochemistry. 2024
- 13Phenolics as GABA(A) Receptor Ligands: An Updated ReviewPMIDRíos JL, Schinella GR, Moragrega I · Molecules (Basel, Switzerland) · 2022
Ríos JL, Schinella GR, Moragrega I. Phenolics as GABA(A) Receptor Ligands: An Updated Review. Molecules (Basel, Switzerland). 2022
- 14United States Pharmacopeia (USP) Safety Review of Gamma-Aminobutyric Acid (GABA)PMIDOketch-Rabah HA et al. · Journal of Dietary Supplements · 2021
No serious adverse events associated with GABA at intakes up to 18 g/day for 4 days and 120 mg/day for 12 weeks; chronic administration showed no toxicity signs.
- 15Effects of Oral Gamma-Aminobutyric Acid (GABA) Administration on Stress and Sleep in Humans: A Systematic ReviewPMIDHepsomali P et al. · Frontiers in Neuroscience · 2020
Systematic review of 14 placebo-controlled human trials found limited evidence for stress benefits and very limited evidence for sleep benefits of oral GABA intake.
- 16GABA supplementation and growth hormone: a brief reviewSource linkedPMIDPowers ME, Yarrow JF, McCoy SC, Borst SE · Med Sport Sci · 2008
Observational studies
1- 17Molecular and clinical descriptions of patients with GABA(A) receptor gene variants (GABRA1, GABRB2, GABRB3, GABRG2): A cohort study, review of literature, and genotype-phenotype correlationPMIDMaillard PY, Baer S, Schaefer É et al. · Epilepsia · 2022
Maillard PY, Baer S, Schaefer É et al.. Molecular and clinical descriptions of patients with GABA(A) receptor gene variants (GABRA1, GABRB2, GABRB3, GABRG2): A cohort study, review of literature, and genotype-phenotype correlation. Epilepsia. 2022
Mechanistic & preclinical
1- 18GABA and l-theanine mixture decreases sleep latency and improves NREM sleepSource linkedPMIDKim S, Jo K, Hong KB et al. · Pharm Biol · 2019
Common questions.
Quick answers about GABA, drawn from the data on this page.
What is GABA?
Primary inhibitory neurotransmitter supplement for relaxation and sleep.
What is GABA used for?
Commonly cited benefits of GABA include: Relaxation; Sleep support; Anxiety reduction; Growth hormone. NutriStack rates the overall evidence as emerging.
What is a typical dose of GABA?
A typical adult dose of GABA is 250-750 mg daily. The commonly recommended form is PharmaGABA (naturally fermented, preferred). These are general ranges, not personalized advice; confirm the right dose with a clinician.
What are the side effects of GABA?
Reported side effects include drowsiness, tingling, shortness of breath (rare). This is educational information; check with a healthcare professional before use.
How strong is the evidence for GABA?
NutriStack rates this as Emerging, meaning early RCT signal, mechanistic data, or limited human evidence. Full tier criteria are at https://nutristackapp.com/methodology/evidence-tiers.
Use this with your stack
GABA in NutriStack.
Add it to your stack, see how it interacts with everything else you take, and get a Stack Score that updates the moment it does.