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evidence · mechanism · dose
Supplements/Amino Acid

GABA

aka Gamma-aminobutyric acid

Primary inhibitory neurotransmitter; oral supplementation has limited CNS penetration.

Mood & AnxietySleep & Recovery

Overview

Primary inhibitory neurotransmitter; oral supplementation has limited CNS penetration.

Natural sources
  • Fermented foods
  • Tea
Common forms
  • GABA
  • PharmaGABA (fermented)

Forms & variants of GABA

Different chemical forms of GABA behave differently. Browse each form's mechanism, bioavailability, and best-use context.

PharmaGABA
GABA (Pharma-grade)

Fermented GABA with reported peripheral relaxation effects.

Mechanism of action

Activates GABA-A and GABA-B receptors; oral GABA acts primarily on peripheral / enteric nervous system.

Pathways
  • · GABAergic inhibition
Neurotransmitters
  • · GABA

Effects on the body

Increases
Subjective relaxation
Increases
Alpha EEG

Organ system effects

Brain & CNS

Limited BBB crossing; effects may be peripheral / vagal.

Evidence-based benefits

Reduces subjective anxiety (small trials)

Limited evidence

Potential side effects

Common
  • · Tingling
  • · Mild drowsiness
Rare
    Serious

      Drug interactions

      Benzodiazepines / barbiturates
      Theoretical additive sedation.
      moderate

      Safety & non-supplemental interactions

      Educational summary — always confirm with your clinician or pharmacist before starting, stopping, or combining with prescription therapy.

      Avoid / monitor with these medications
      • ·Alcohol, benzodiazepines, opioids, sedating antihistamines (additive CNS depression)

      Supplement interactions

      Pairs well with

      None listed.

      Avoid combining with

      No specific avoidances listed.

      Dosing & bioavailability

      Typical dose
      100–500 mg

      Where to buy

      Affiliate-style search links to reputable retailers. We don't endorse specific brands — verify third-party testing (USP, NSF, Informed Sport) before purchase.

      Amino Acid
      GABA
      Amazon
      Wide selection · fast shipping
      Amino Acid
      GABA
      iHerb
      Global delivery · curated brands
      Amino Acid
      GABA
      Thorne
      Practitioner-grade · NSF tested

      Scientific evidence (8)

      Systematic reviewExamine.com Supplement Database · 2023

      GABA: pharmacology, clinical evidence, and safety — narrative review

      Examine.com Research Team

      Curated narrative review of human and preclinical evidence for GABA, including mechanism, typical dosing, and safety considerations.

      Key findings

      Best-supported outcome: Reduces subjective anxiety (small trials) (evidence: limited). Additional outcomes and limitations summarized in the full profile.

      Open study
      Systematic reviewPubMed (NLM) · 1970

      PubMed: GABA — Reduces subjective anxiety

      Live PubMed search

      Live results for "GABA Reduces subjective anxiety" across the PubMed/MEDLINE peer-reviewed index.

      Key findings

      Opens current human and preclinical literature matching GABA and "Reduces subjective anxiety". Filter by RCT, meta-analysis, or year on the results page.

      Open study
      Systematic reviewPubMed (NLM) · 1970

      PubMed: GABA — randomized controlled trial

      Live PubMed search

      Live results for "GABA randomized controlled trial" across the PubMed/MEDLINE peer-reviewed index.

      Key findings

      Opens current human and preclinical literature matching GABA and "randomized controlled trial". Filter by RCT, meta-analysis, or year on the results page.

      Open study
      Systematic reviewPubMed (NLM) · 1970

      PubMed: GABA — meta-analysis

      Live PubMed search

      Live results for "GABA meta-analysis" across the PubMed/MEDLINE peer-reviewed index.

      Key findings

      Opens current human and preclinical literature matching GABA and "meta-analysis". Filter by RCT, meta-analysis, or year on the results page.

      Open study
      Systematic reviewPubMed (NLM) · 1970

      PubMed: GABA — pharmacokinetics

      Live PubMed search

      Live results for "GABA pharmacokinetics" across the PubMed/MEDLINE peer-reviewed index.

      Key findings

      Opens current human and preclinical literature matching GABA and "pharmacokinetics". Filter by RCT, meta-analysis, or year on the results page.

      Open study
      Systematic reviewPubMed (NLM) · 1970

      PubMed: GABA — safety adverse events

      Live PubMed search

      Live results for "GABA safety adverse events" across the PubMed/MEDLINE peer-reviewed index.

      Key findings

      Opens current human and preclinical literature matching GABA and "safety adverse events". Filter by RCT, meta-analysis, or year on the results page.

      Open study
      Systematic reviewPubMed (NLM) · 1970

      PubMed: GABA — dose response

      Live PubMed search

      Live results for "GABA dose response" across the PubMed/MEDLINE peer-reviewed index.

      Key findings

      Opens current human and preclinical literature matching GABA and "dose response". Filter by RCT, meta-analysis, or year on the results page.

      Open study
      Systematic reviewGoogle Scholar · 1970

      Google Scholar: GABA — clinical evidence

      Live Scholar search

      Cross-database citation index for GABA as it relates to "clinical evidence".

      Key findings

      Includes preprints, theses, and journal articles. Useful for tracking citation counts and follow-on work.

      Open study
      Educational use only. This profile is not medical advice. Consult a qualified healthcare professional before starting any supplement, especially if you take prescription medication or have a chronic condition.