GABA · Gamma-Aminobutyric Acid
The brain's main calming neurotransmitter, sold as a sleep aid. Whether oral GABA reaches the brain at all is still debated.
Short answer
Promising small trials, unresolved mechanism. Low risk, modest expectations.
Product and dose overview
GABA (Gamma-Aminobutyric Acid) is a sleep / circadian with evidence grade D, meaning it is primarily supported by animal studies. We track 0 products containing GABA. The top-ranked product scores 0 out of 10 on our composite scale (dose, evidence, price, testing, transparency). Prices range up to $0.00 per month.
What it is
GABA is the neurotransmitter that quiets nerve activity in your brain. Supplements try to deliver more of it through the gut.
Why people take it
Small trials — mostly from Japan — report that oral GABA shortens the time to fall asleep and improves sleep quality scores. The catch: GABA crosses the blood-brain barrier poorly, so researchers still argue about how an oral dose could work. Effects may run through the gut nervous system.
Our verdict
Promising small trials, unresolved mechanism. Low risk, modest expectations.
Structure & class
γ-aminobutyric acid. Oral bioavailability to CNS questioned; hypothesized enteric/vagal mechanism.
Mechanism & clinical data
Yamatsu et al. 2016 reported reduced sleep latency with 100 mg GABA before bed. Boonstra et al. 2015 (Front Psychol) reviewed the oral GABA literature and concluded central effects are plausible but unproven given blood-brain barrier limitations. Most trials are small, short, and partly manufacturer-linked.
Pharmacokinetics
Short plasma half-life; taken 30-60 minutes before sleep in trials.
Dose & forms
What to watch out for
If a product hides GABA in a proprietary sleep blend below 100 mg, it is below the studied range. Do not combine with sedative medication without medical advice.
Where this dose comes from
The trial dose above is our editorial pick from the published human trials for this ingredient. We choose the dose that the best-available studies used on the endpoint most relevant to longevity. The range shows the lowest and highest doses tested in published trials. The landmark studies below are the papers we read to set it. You can click through and check our work.
When new trials publish, our automated sweeps flag them. If a new study materially changes the dose, we update it through editorial review and record the old dose, new dose, and the triggering study in every affected product's recommendation history. The dose is never changed automatically.
Regulatory status
Timeline
Regulatory events, evidence grade changes, and key research milestones for GABA, most recent first. Studies link to the paper; regulatory entries name and link the responsible authority.
-
EU Court sharpens the bar for botanical health claimsA Court of Justice of the European Union ruling in April 2025 further tightened the requirements for how botanical ingredients (herbs, plant extracts) can be marketed with health claims in the EU, effectively removing much of the flexibility of the on-hold list.
-
EU report identifies 117 supplement substances as potential health risksThe HoA Working Group on Food Supplements (26 European countries) published its first report evaluating 117 substances used in food supplements. Of these, 65 were assessed as likely novel foods, 6 were already regulated, 34 had insufficient data, and 12 were prioritized for Article 8 restriction under Regulation (EC) No 1925/2006. The 12 priority substances include ashwagandha, curcumin, melatonin, piperine, St. John's wort, coumarin, p-synephrine, maca, holy basil, Melaleuca, black cohosh, and L-tryptophan. The report drew on 1,500 RASFF alerts reviewed between 2017 and mid-2022.
-
Boonstra et al. 2015 (Front Psychol)Review of oral GABA administration: some evidence of central and peripheral effects, but blood-brain barrier penetration remains unresolved.
-
EU Health Claims Regulation adoptedRegulation (EC) No 1924/2006 laid down harmonised rules for nutrition and health claims made on foods, including supplements. Only claims listed in the EU Register of authorised claims can be used. Rejected botanical claims are held in a separate on-hold list.
-
EU introduces the Novel Food RegulationRegulation (EC) No 258/97 required any food or food ingredient without a history of consumption in the EU before 15 May 1997 to be authorised before being placed on the market. This is the framework that captures NMN, spermidine as a supplement ingredient, urolithin A, and many other longevity actives.
-
GABA & sleep trial (PMC)Human trial: oral GABA before bedtime shortened sleep latency and improved early-night sleep measures.
Landmark studies
-
GABA & sleep trial (PMC)
Human trial: oral GABA before bedtime shortened sleep latency and improved early-night sleep measures.
Read study → -
Boonstra et al. 2015 (Front Psychol)
Review of oral GABA administration: some evidence of central and peripheral effects, but blood-brain barrier penetration remains unresolved.
Read study →
Found in these products
All products in our catalog that contain GABA, ranked by our overall score. Ranking is editorial, never paid.
No products in our catalog contain this yet.
Buying guides and comparisons
Related ingredients
See all in Sleep / Circadian →Molecules in the same class, plus the actives most often formulated alongside GABA in our catalogue.
See GABA in context: the mechanism it acts through, the biomarker it moves, the products that dose it, and the trials that tested it.
View GABA on the Longevity Map →Frequently asked questions
What is GABA?
GABA is the neurotransmitter that quiets nerve activity in your brain. Supplements try to deliver more of it through the gut.
What dose of GABA should I take?
The trial dose in published human studies is 100 mg per day, with a range of 100 to 300 mg per day. Always consult a qualified clinician before starting any supplement.
Is GABA safe?
If a product hides GABA in a proprietary sleep blend below 100 mg, it is below the studied range. Do not combine with sedative medication without medical advice.
What is the best GABA supplement?
We track 0 products containing GABA. The top-ranked product scores 0 out of 10 on our composite scale, which evaluates dose, evidence, price, third-party testing, and transparency. See the comparison table above. Scores are editorial judgments, not a scientific standard.
What is the evidence grade for GABA?
GABA has evidence grade D, meaning it is primarily supported by animal studies. Grade A means replicated human RCTs with hard endpoints. Grade B means human RCTs with biomarker outcomes. Grade C means mixed or small human trials. See our evidence grading methodology.
Data verification
Evidence grades are reviewed when new human RCTs are published. Product counts update automatically as new products are added. Dose ranges reflect published trial data, not brand recommendations. Read how we verify.