tuneTypical Dose
250-750 mg per day
Natural Compound
GABA
γ-Aminobutyric acid (4-aminobutanoic acid)
Evidence TierDWADA NOT PROHIBITED
watchEffect Window
Acute effects within 30-60 minutes.
check_circleCompliance
WADA NOT PROHIBITED
Overview
Clinical Summary
GABA is the primary inhibitory neurotransmitter in the nervous system. Oral GABA is used for relaxation and sleep quality goals, despite debated central nervous system penetration.
Small human studies suggest reduced stress markers and modest improvements in relaxation and sleep quality in some individuals. Effects may involve peripheral GABA receptors and autonomic regulation rather than direct brain delivery. Minority evidence includes small reductions in stress-related blood pressure. Benefits are typically subtle and variable, and outcomes depend on dose and formulation.
Primary inhibitory neurotransmitter in the CNS, but oral supplementation has poor blood-brain barrier permeability. Effects may occur via enteric nervous system or peripheral GABA receptors rather than central action.
Outcomes
What This Is Expected To Influence
Primary Outcomes
- Modest acute reduction in perceived stress and anxiety with increased alpha brain waves, though mechanism is unclear due to poor BBB penetration.
Secondary Outcomes
- Transient Growth Hormone spike post-exercise (anabolic significance unproven)
Safety
Contraindications and Interactions
Contraindications
- None established at standard doses
Side effects
- Drowsiness
- Tingling/flushing (paresthesia)
Interactions
- Sedatives (theoretical potentiation)
- Benzodiazepines (theoretical potentiation)
Avoid if
- Heavy sedative or benzodiazepine regimens
Evidence
Study-level References
gaba-SRC-001Clinical trial
Sourceopen_in_newAbdou AM, Higashiguchi S, Horie K, et al. Relaxation and immunity enhancement effects of gamma-aminobutyric acid (GABA) administration in humans. Biofactors. 2006;26(3):201-8. doi:10.1002/biof.5520260305. PMID:16971751.
Population: Study 1 involved 13 healthy subjects. Study 2 involved 8 acrophobic subjects divided into placebo and GABA groups.
Dose protocol: 100 mg oral GABA, single acute dose, EEG recorded at 60 minutes post-ingestion
Key findings: Oral intake of 100 mg GABA significantly increased alpha waves and decreased beta waves compared to water or L-theanine controls within 60 minutes. A second experiment showed GABA maintained salivary IgA levels during stress in acrophobic subjects, while placebo subjects showed marked decreases.
Paper content
Oral GABA administration significantly increased alpha waves and decreased beta waves on EEG compared to water or L-theanine within 60 minutes, indicating relaxation and reduced anxiety. In acrophobic subjects, GABA supplementation maintained higher salivary IgA levels during a stressful task compared to placebo, suggesting enhanced immunity under stress.
gaba-SRC-002RCT
Sourceopen_in_newHara Y, Nakamura U, Koga K, et al. Gamma-Aminobutyric Acid Intake Improves Psychological State and Performance in Esports: A Randomized, Placebo-Controlled, Double-Blind Crossover Study. Nutrients. 2025;17(11):1870. doi:10.3390/nu17111870. PMID:40507139.
Population: Healthy male university students who regularly play esports
Dose protocol: 200 mg oral GABA, single acute dose before esports gameplay, crossover design
Key findings: In a crossover RCT of 8 healthy males, acute GABA intake (200 mg) significantly reduced psychological confusion-bewilderment and fatigue compared to placebo. Task performance scores were also significantly higher in the GABA condition.
Notes: Very small sample (n=8). Supports acute psychological effects of oral GABA in a controlled setting.
Paper content
This small crossover RCT found that 200 mg GABA intake before esports gameplay significantly reduced confusion-bewilderment and fatigue while improving game performance scores compared to placebo in 8 healthy young male esports players.