--- title: "GABA: Research & Side Effects | BodyHackGuide" url: https://www.bodyhackguide.co/compound/gaba description: "GABA (gamma-aminobutyric acid): mechanism, clinical studies & side effects." lang: en --- Skip to content Compare notes on r/BodyHackGuide (https://reddit.com/r/bodyhackguide) Compare notes with other researchers. Join r/BodyHackGuide (https://reddit.com/r/bodyhackguide) # GABA (gamma-aminobutyric acid) Supplement: https://www.bodyhackguide.co/wiki#cat-supplement Status Phase 2,, not approved for human use Evidence Not graded on a research bench yet GABA (gamma-aminobutyric acid) is an amino acid that serves as the main inhibitory chemical messenger (neurotransmitter) in the brain; the body makes GABA from glutamate, and GABA is also found in foods such as green tea, tomatoes and fermented cheese. Reviewed 28 October 2026 01 Overview ## What GABA (gamma-aminobutyric acid) is Oral GABA is marketed in the United States as a dietary supplement (PMID: 34444905), but whether swallowed GABA crosses the blood-brain barrier is unsettled: animal studies found little entry into the brain, and a 2020 systematic review found no human data on the question (PMID: 6475496; PMID: 11595763; PMID: 33041752). The 14 placebo-controlled human studies of GABA on stress and sleep in that review were small, with 7 to 63 participants each, and 11 had at least one author employed by industry (PMID: 33041752). The review rated the evidence as limited for stress and very limited for sleep (PMID: 33041752). ### How it works ### GABA in the body GABA is the main inhibitory neurotransmitter in the human cortex (PMID: 26500584). Cells make GABA from the amino acid glutamate using the enzyme glutamic acid decarboxylase (GAD), which pancreatic beta cells also carry (PMID: 39619323; PMID: 36566274). GABA acts through two receptor families: GABA-A receptors, which are ion channels (ionotropic), and GABA-B receptors, which work through cell signaling cascades (metabotropic); benzodiazepines, barbiturates and several anesthetics act on GABA-A receptors (PMID: 26365137). Outside the brain, GABA is concentrated in pancreatic beta cells (PMID: 39619323), and gut bacteria, including Bacteroides species, actively express GABA-producing pathways in the human gut (PMID: 30531975). GABA is also present in foods such as green tea, tomato and fermented cheese (PMID: 22203366; PMID: 39619323). Read the full mechanism Show less ### Does oral GABA reach the brain? This is an open question. A 2015 review found that GABA has long been thought unable to cross the blood-brain barrier, but that the studies on the question are often contradictory and use widely varying methods, and the authors called for brain imaging with magnetic resonance spectroscopy after oral GABA (PMID: 26500584). A 2020 systematic review found no data on passage of GABA across the blood-brain barrier in humans; blood GABA rises about 30 minutes after an oral dose, but whether brain GABA rises is unknown (PMID: 33041752; PMID: 30263304). A 2024 review, by contrast, states that oral GABA does not cross the blood-brain barrier (PMID: 39619323). - Rats: radiolabeled GABA injected into the blood entered all brain regions poorly (PMID: 6475496), and GABA left the brain across the barrier at least 16 times faster than it entered, which the authors described as an efflux pump (PMID: 11595763). Intravenous GABA changed the brain's response on functional MRI only after focused ultrasound opened the barrier (PMID: 30659957). - Mice: brain capillary cells carry a GABA transporter (GAT2/BGT-1), which the authors linked to GABA transport across the barrier (PMID: 11598501). - People: EEG studies reported changes in brain wave patterns after oral GABA (PMID: 16971751; PMID: 22203366), which a 2020 review took as limited evidence of an effect on the brain, while noting that human data on barrier passage are missing (PMID: 33041752). ### Other routes researchers propose The 2015 review suggested that any effects of oral GABA might come either from passage into the brain or, more indirectly, through the nerves of the gut (the enteric nervous system) (PMID: 26500584). In mice, GABA given by mouth suppressed short-term food intake, and cutting the sensory fibers of the vagus nerve blunted that effect (PMID: 35745222). ### Hormone changes measured in people - Growth hormone: a single 5 g oral dose raised plasma growth hormone in 19 people compared with 18 on placebo, while prolactin rose in only 5 of 15 (PMID: 7376786); in 11 resistance-trained men, 3 g raised resting growth hormone peaks by about 400 percent (PMID: 18091016). - Insulin and glucagon: in 12 healthy volunteers, a single 2 g dose raised fasting insulin 1.6-fold and a week of 2 g three times a day raised it 2.0-fold; fasting glucagon also rose, and blood glucose did not change (PMID: 26617516). ### Studied for - Neuroscience - Sleep research - Stress physiology - Endocrinology - Food science - Gut microbiome research ### Benefits listed - Shorter time to fall asleep on polysomnography in a 40-person trial (30 on GABA) - Shorter sleep latency and longer non-REM sleep on EEG in a 10-person crossover study - Smaller drop in EEG alpha and beta activity during a stressful mental task (63-person crossover study) - Lower systolic blood pressure with GABA-containing fermented milk or Chlorella in trials of 39 and 80 people Show 2 more Show less - Higher growth hormone after a single oral dose (studies of 19 and 11 people) - Higher circulating insulin and glucagon in a 12-person pharmacokinetic study 02 Research Free with email ## What the research shows No research bench grades GABA (gamma-aminobutyric acid) yet. Benches compare compounds people pair, with the evidence for each. ### Unlock the research summary Enter your email to keep reading. It is free, and it opens these sections on every compound page in this browser. - A summary of the key research - Safety and side effects - A link to the PubMed results You also get the free peptide cheat sheet by email. Unsubscribe anytime. Have an account? Sign in (https://www.bodyhackguide.co/auth) 03 Safety ## GABA side effects and interactions ### Side effects #### Common - Dizziness and sore throat with repeated doses in a 12-person study (PMID: 26617516) - Adverse events in 4 of 40 participants in a 4-week sleep trial (PMID: 29856155) #### Serious events - No serious adverse events reported in the clinical studies reviewed by the US Pharmacopeia in 2021 (PMID: 34444905) ### Who should not use it Contraindications No drug label exists for GABA, so no formal contraindications have been set. Cautions in the literature: - Blood pressure medicines: because some studies found that GABA lowered blood pressure, the USP review judged it conceivable that GABA taken with antihypertensive drugs could raise the risk of low blood pressure (PMID: 34444905). - Pregnancy and breastfeeding: the USP review found no studies in pregnancy or breastfeeding and advised caution because GABA can affect neurotransmitters and hormones such as growth hormone and prolactin (PMID: 34444905). - Drugs that act on the GABA system: registered trials of oral GABA excluded people taking baclofen, benzodiazepines, gabapentin or pregabalin (ClinicalTrials.gov NCT02002130; NCT04683640). - Seizure disorders and low blood pressure: a pediatric diabetes trial excluded children with a history of seizures, and a sleep and pain trial excluded people with low blood pressure (ClinicalTrials.gov NCT02002130; NCT04683640). ### Interactions 2 pairings in our record: 1 with a caution and 1 to monitor. - Benzodiazepines, baclofen, gabapentin and pregabalin Caution Registered trials of oral GABA excluded people taking baclofen, benzodiazepines, gabapentin or pregabalin (ClinicalTrials.gov NCT02002130; NCT04683640); PubMed lists no interaction study. - Blood pressure medicines Monitor Some studies found that GABA lowered blood pressure, and a 2021 USP safety review judged it conceivable that GABA taken with antihypertensive drugs could raise the risk of low blood pressure (PMID: 34444905). This interaction data is compiled from published research and community reports. It may not be exhaustive. Always consult a healthcare professional before combining compounds. Need bloodwork before starting? Full hormone + metabolic panels from Anabolic Insights. Code CHONCH for first-order discount. Order Bloodwork (https://anabolicinsights.ai/?ref=nwm2zjb) 04 Dosing Free with email ## Dosing No dose on record Our record lists no dose for GABA (gamma-aminobutyric acid). This section holds what it does list. ### Unlock the Dosing section - Route 05 Prices ## GABA (gamma-aminobutyric acid) prices No listings We do not track a vendor for GABA (gamma-aminobutyric acid) yet, so this page states no price. 06 Chemistry ## Chemistry and structure Molecular formula C4H9NO2 Molecular mass 103.12 g/mol CAS number 56-12-2 Half-life About 5 hours after oral doses in a 2015 study of 12 healthy volunteers, with peak blood levels 0.5 to 1 hour after dosing (PMID: 26617516); another study found blood GABA highest 30 minutes after an oral dose (PMID: 30263304) View on PubChem (https://pubchem.ncbi.nlm.nih.gov/compound/119) 07 Related ## Related to GABA (gamma-aminobutyric acid) ### In the same category - 5-HTP (5-hydroxytryptophan)Phase 2 5-HTP (5-hydroxytryptophan) is an amino acid that the body makes from tryptophan on the way to serotonin and melatonin, and the L form sold in supplements has been extracted commercially from the seeds of the West African plant Griffonia simplicifolia.: https://www.bodyhackguide.co/compound/5-htp - Agmatine SulfatePhase 2/3 Agmatine sulfate is the sulfate salt of agmatine, a molecule made by removing a carboxyl group from the amino acid arginine, which is found in mammalian brain, in gut bacteria and in many foods.: https://www.bodyhackguide.co/compound/agmatine - L-GlutaminePhase 3 L-glutamine is an amino acid the body makes for itself, which researchers call conditionally essential because the body's needs may outrun its own production during severe illness or stress.: https://www.bodyhackguide.co/compound/l-glutamine - ProbioticsDietary Supplement Probiotics — defined by the joint FAO/WHO 2001 consensus as "live microorganisms which, when administered in adequate amounts, confer a health benefit on the host" — are the most widely sold and most widely misunderstood category of dietary supplement.: https://www.bodyhackguide.co/compound/probiotics - SAM-e (S-adenosylmethionine)Phase 3 SAM-e (S-adenosylmethionine, also called ademetionine or AdoMet) is a molecule that mammalian cells make from the amino acid methionine and ATP, and it is the main donor of methyl groups for the body's methylation reactions.: https://www.bodyhackguide.co/compound/sam-e All compounds (https://www.bodyhackguide.co/wiki) ### Compare GABA (gamma-aminobutyric acid) - Alternatives to GABA (gamma-aminobutyric acid): https://www.bodyhackguide.co/alternatives-to/gaba ### Research tools - Peptide Calculator Reconstitution and syringe units: https://www.bodyhackguide.co/tools/reconstitution - Reconstitution Guide How to mix, step by step: https://www.bodyhackguide.co/guides/how-to-reconstitute-peptides - Nasal Spray Calc mL per actuation: https://www.bodyhackguide.co/tools/intranasal - Half-Life Visualizer Decay curves: https://www.bodyhackguide.co/tools/halflife All articles (https://www.bodyhackguide.co/blog) 08 Questions ## Frequently asked questions What is GABA? GABA (gamma-aminobutyric acid) is the main inhibitory neurotransmitter in the brain, and the body makes GABA from glutamate (PMID: 26500584; PMID: 39619323). GABA is also found in foods such as green tea, tomato and fermented cheese (PMID: 22203366; PMID: 39619323). GABA is marketed in the United States as a dietary supplement (PMID: 34444905). Does oral GABA cross the blood-brain barrier? Whether oral GABA crosses the blood-brain barrier is unsettled, and a 2015 review found the studies of GABA and the barrier contradictory and varied in method (PMID: 26500584). In rats, injected GABA entered the brain poorly and left the brain at least 16 times faster than it entered (PMID: 6475496; PMID: 11595763). A 2020 systematic review found no human data on GABA crossing the blood-brain barrier (PMID: 33041752). A 2024 review states that oral GABA does not cross the barrier (PMID: 39619323). Does GABA improve sleep? A 2020 systematic review rated the evidence for oral GABA and sleep as very limited (PMID: 33041752). In a 40-person polysomnography trial of GABA, time to fall asleep fell from 13.4 to 5.7 minutes in the 30-person GABA group (PMID: 29856155). In a 33-person phase 2 trial, Pittsburgh sleep quality scores improved by 1.9 points with GABA and by 3.1 points with placebo, and no comparison between the groups is posted (ClinicalTrials.gov NCT04683640 results). Does GABA reduce stress? A 2020 systematic review rated the evidence for oral GABA and stress as limited, based on studies of 7 to 63 people that mostly tested single doses (PMID: 33041752). In a 63-person crossover study, GABA lessened changes in brain waves during a stressful task (PMID: 22203366), but a 2020 review reports that self-rated tension and relaxation with GABA did not differ from placebo (PMID: 33041752). Most evidence for a calming effect of GABA came from researchers with a potential conflict of interest (PMID: 26500584). Is GABA approved by the FDA? GABA is not an FDA-approved drug, and Drugs@FDA lists no product with GABA as its active ingredient (openFDA search, 25 October 2026). GABA is marketed in the United States as a dietary supplement (PMID: 34444905), a category the FDA does not approve before marketing (FDA, Questions and Answers on Dietary Supplements). Two GRAS notices for GABA as a food ingredient, filed with the FDA in 2008 and 2015, were closed when the notifier asked the FDA to stop evaluating them (FDA GRAS Notice Inventory, GRN 257 and GRN 595). Does GABA lower blood pressure? GABA-containing fermented milk lowered systolic blood pressure more than placebo in a 39-person trial (PMID: 12627188), and GABA-rich Chlorella lowered systolic blood pressure in an 80-person trial (PMID: 19811362). GABA-enriched bread did not lower 24-hour blood pressure more than other breads in a 30-person trial (PMID: 26579797). The USP safety review found transient blood pressure drops of less than 10 percent with GABA in some studies (PMID: 34444905). What side effects have GABA studies reported? A 2021 US Pharmacopeia review found no serious adverse events with GABA in clinical studies at up to 18 g a day for 4 days (PMID: 34444905). Repeated 2 g doses of GABA three times a day brought minor dizziness and sore throat in a 12-person study (PMID: 26617516). Oral GABA also raised growth hormone after single large doses (PMID: 7376786; PMID: 18091016), and the USP review advised caution with GABA in pregnancy and breastfeeding because GABA can affect hormones such as growth hormone and prolactin (PMID: 34444905). Free 2026 Peptide Cheat Sheet (PDF) 38 compounds and blends: vial sizes, BAC water volumes, dosing ranges and bloodwork markers. Download Free (https://www.bodyhackguide.co/guides/peptide-cheat-sheet-download) BodyHackGuide (https://www.bodyhackguide.co/) Your biohacking research hub: compound pricing, brain health protocols, dosing tools, and vendor reviews. support@bodyhackguide.co Join our Discord: https://discord.gg/Mhq5UdRYBA r/BodyHackGuide on Reddit: https://reddit.com/r/BodyHackGuide **Affiliate Disclosure:** We rank every vendor on the same public, reproducible methodology (https://www.bodyhackguide.co/vendors/methodology). Full details in our affiliate disclosure (https://www.bodyhackguide.co/affiliate-disclosure). **Research Disclaimer:** All compounds listed are for laboratory and research purposes only. Not for human consumption. This site does not sell or ship any products. Always consult a qualified healthcare professional and comply with local regulations. © 2026 BodyHackGuide. 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GABA acts through two receptor families: GABA-A receptors, which are ion channels (ionotropic), and GABA-B receptors, which work through cell signaling cascades (metabotropic); benzodiazepines, barbiturates and several anesthetics act on GABA-A receptors (PMID: 26365137). Outside the brain, GABA is concentrated in pancreatic beta cells (PMID: 39619323), and gut bacteria, including Bacteroides species, actively express GABA-producing pathways in the human gut (PMID: 30531975). GABA is also present in foods such as green tea, tomato and fermented cheese (PMID: 22203366; PMID: 39619323). Does oral GABA reach the brain? This is an open question. A 2015 review found that GABA has long been thought unable to cross the blood-brain barrier, but that the studies on the question are often contradictory and use widely varying methods, and the authors called for brain imaging with magnetic resonance spectroscopy after oral GABA (PMID: 26500584). A 2020 systematic review found no data on passage of GABA across the blood-brain barrier in humans; blood GABA rises about 30 minutes after an oral dose, but whether brain GABA rises is unknown (PMID: 33041752; PMID: 30263304). A 2024 review, by contrast, states that oral GABA does not cross the blood-brain barrier (PMID: 39619323). Rats: radiolabeled GABA injected into the blood entered all brain regions poorly (PMID: 6475496), and GABA left the brain across the barrier at least 16 times faster than it entered, which the authors described as an efflux pump (PMID: 11595763). Intravenous GABA changed the brain's response on functional MRI only after focused ultrasound opened the barrier (PMID: 30659957). Mice: brain capillary cells carry a GABA transporter (GAT2/BGT-1), which the authors linked to GABA transport across the barrier (PMID: 11598501). People: EEG studies reported changes in brain wave patterns after oral GABA (PMID: 16971751; PMID: 22203366), which a 2020 review took as limited evidence of an effect on the brain, while noting that human data on barrier passage are missing (PMID: 33041752). Other routes researchers propose The 2015 review suggested that any effects of oral GABA might come either from passage into the brain or, more indirectly, through the nerves of the gut (the enteric nervous system) (PMID: 26500584). In mice, GABA given by mouth suppressed short-term food intake, and cutting the sensory fibers of the vagus nerve blunted that effect (PMID: 35745222). Hormone changes measured in people Growth hormone: a single 5 g oral dose raised plasma growth hormone in 19 people compared with 18 on placebo, while prolactin rose in only 5 of 15 (PMID: 7376786); in 11 resistance-trained men, 3 g raised resting growth hormone peaks by about 400 percent (PMID: 18091016). Insulin and glucagon: in 12 healthy volunteers, a single 2 g dose raised fasting insulin 1.6-fold and a week of 2 g three times a day raised it 2.0-fold; fasting glucagon also rose, and blood glucose did not change (PMID: 26617516).", "legalStatus": "Not approved for human use (research chemical)", "warning": "For research purposes only. Not for human consumption." } }, { "@context": "https://schema.org", "@type": "FAQPage", "mainEntity": [ { "@type": "Question", "name": "What is GABA?", "acceptedAnswer": { "@type": "Answer", "text": "GABA (gamma-aminobutyric acid) is the main inhibitory neurotransmitter in the brain, and the body makes GABA from glutamate (PMID: 26500584; PMID: 39619323). GABA is also found in foods such as green tea, tomato and fermented cheese (PMID: 22203366; PMID: 39619323). 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Oral GABA also raised growth hormone after single large doses (PMID: 7376786; PMID: 18091016), and the USP review advised caution with GABA in pregnancy and breastfeeding because GABA can affect hormones such as growth hormone and prolactin (PMID: 34444905)." } } ] }, { "@context": "https://schema.org", "@type": "Organization", "@id": "https://www.bodyhackguide.co#organization", "name": "BodyHackGuide", "alternateName": "BHG", "url": "https://www.bodyhackguide.co", "logo": { "@type": "ImageObject", "url": "https://www.bodyhackguide.co/logo.png", "width": 512, "height": 512 }, "description": "Evidence-based research reference for peptides and nootropics. 273 compound profiles, interactive dosing calculators, vendor price comparisons, and trust-scored vendor reviews scored on a public, reproducible methodology applied to every vendor. 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