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Inhibitory neurotransmitter supplement · Fact sheet

GABA

Also known as Gamma-aminobutyric acid

GABA is an inhibitory neurotransmitter also sold as an oral supplement. Small trials of specific rice-derived preparations found some sleep signals, but oral GABA is not equivalent to a prescription GABA-active drug.

Not FDA approvedEarly human evidence
Brain, mood & sleep

What is GABA?

Supplement GABA, phenibut, gabapentin and benzodiazepines are different substances. They should not share an assumed mechanism, safety profile or regimen.

Endogenous brain GABA physiology does not establish how an oral supplement produces any observed effect.

Benefits & claims

Interest in GABA spans cognition and sleep. Study findings apply to the named formulation and population.

What the evidence supports

  • The study reported shorter sleep latency and greater sleep efficiency in the active group.
  • A separate low-dose study evaluated another rice-germ exposure.
  • These studies do not establish a universal insomnia treatment, withdrawal treatment or effect across all formulations.
Research areas
  • Formulation-specific human outcomes
  • Mechanistic research

Dosage & frequency

Human study context

This is an exposure from a named human study, not a generally established treatment or enhancement regimen.

Rice-germ GABA insomnia-symptom study

40 adults with insomnia symptoms; 30 active and ten placebo

Amount
300 mg of GABA from the studied rice-germ extract
Frequency
Daily for four weeks
Route studied or labeled
Oral

A formulation-specific short study, not a prescription-drug equivalent or established chronic insomnia schedule. Full eligibility and sleep-testing details are in the source.

Safety and Efficacy of Gamma-Aminobutyric Acid from Fermented Rice Germ in Patients with Insomnia Symptoms: A Randomized, Double-Blind Trial.
How to read these amounts

An approved regimen belongs to a specific product, indication, and population. A study regimen describes what researchers tested; it does not establish a prescription or a safe self-use protocol. Products, routes, and formulations are not interchangeable. A prescriber uses the full label and individual clinical circumstances.

Personal accounts may describe amounts, schedules and outcomes beyond clinical research. They do not establish a regimen. Read the reported experiences

Formulations, interactions & practical context

Formulation differences

  • Endogenous brain GABA physiology does not establish how an oral supplement produces any observed effect.

Interactions & precautions

  • The reviewed sources do not establish a comprehensive human interaction profile for this exact substance or combination.

What is still unresolved

  • Reproducibility in larger independent trials
  • Long-term outcomes and adverse effects
  • Equivalence of different preparations and interaction profiles
Safety and Efficacy of Gamma-Aminobutyric Acid from Fermented Rice Germ in Patients with Insomnia Symptoms: A Randomized, Double-Blind Trial. Efficacy 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 Trial. FDA: what approval means for supplements

Side effects & risks

  • Four participants in the 40-person study reported adverse events; absence of severe events in a small trial does not establish general safety.
  • Interactions with sedating medicines and long-term exposure remain insufficiently characterized.

This is a summary of the cited evidence, not a complete product label. A lack of human safety data does not establish safety.

Clinical research

Early human evidence

A 40-person study allocated 30 to active treatment and ten to placebo, with sleep testing before and after four weeks. The small sample and imbalance limit inference.

Studies

Personal experiences

Reports describe what someone noticed. They cannot establish cause, typical results, or how often a side effect happens. Amounts and schedules describe the individual account, not an effective or safe dose. Product identity and strength may be unverified, and missing details are left explicit.

No attributable personal accounts were found in the sources reviewed.

Approval status

No FDA-approved GABA drug indication is established for the supplement uses discussed here. Supplement availability is not FDA approval of efficacy or safety.

No FDA-approved product for this entry

Approval covers the labeled product, use and population. A trial phase does not establish success; a stopped program is not ongoing research.

Open questions

  • Reproducibility in larger independent trials
  • Long-term outcomes and adverse effects
  • Equivalence of different preparations and interaction profiles

Summary

These studies do not establish a universal insomnia treatment, withdrawal treatment or effect across all formulations.

Sources

Medical evidence and regulatory sources are listed here. Personal reports are linked separately in the experiences section.

  3. fdaFDA: what approval means for supplements

    Dietary supplements are not approved by FDA for safety and effectiveness before marketing.

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