GABA
Gamma-aminobutyric acid
Supplements. Modern nutrition.
Also called 4-aminobutyric acid, Aminobutyric acid
Pinyin: γ-ān jī dīng suān
Spanish: Ácido gamma-aminobutírico
Limited proof; adds to sedativesA calming chemical messenger that the brain makes on its own, sold as a supplement for stress and sleep.
Did you know? The brain makes GABA from glutamate, its main 'go' signal. GABA then works as the main 'brake' signal that slows nerve firing.
What it may help, and how strong the proof is
- Stress & anxiety. Some small human studies, many using about 100 to 200 mg a day, report lower stress or a calmer mood. The studies are few and small, and results are mixed.See the research: 209 studies in peopleTraditional proof
- Sleep. One small four-week trial in adults with insomnia used 75 mg a day and reported faster sleep onset. Other trials are few, and some have industry ties, so the proof is limited.See the research: 149 studies in peopleTraditional proof
Parts of the body
Traditional use
GABA is not part of old herbal traditions. In recent decades, Japanese food makers developed GABA-enriched foods and teas, and fermented foods such as kimchi and some cheeses contain small amounts.
How it is classified
How people take it
Studies mostly used about 100 to 200 mg a day. Some capsules sold today contain several times that amount. Scientists still debate whether GABA from a pill reaches the brain in useful amounts.
Capsule, powder, tea and food.
Where to get it
Your brain makes GABA from glutamate. Small amounts come from fermented foods such as kimchi and some cheeses. Supplements are made in labs or by fermentation and sold as capsules, powders and teas.
Be careful
Usually well tolerated, but some people feel drowsy or dizzy, or have an upset stomach. GABA may briefly lower blood pressure. Do not combine it with alcohol or sleep medicines without a doctor's advice. Safety in pregnancy and breastfeeding is not well studied.
Avoid if: pregnancy; breastfeeding; low blood pressure.
Mixing with other things
- Works well together
Both are sold as calming supplements. Little research has tested them together.
- Use cautionSleep or anxiety medicine (Ambien, Xanax, Ativan)
Adds to the drowsiness of sedatives and sleep medicines.
- Use cautionAlcohol (beer, wine, spirits)
Alcohol and GABA both calm the brain, so together they can add to drowsiness.
- Use cautionBlood pressure medicine (lisinopril, amlodipine, losartan)
May lower blood pressure a little. Watch for dizziness if you take blood pressure medicine.
Adds up with others that may lower blood pressure: , , , , , , , , , , , , , and 16 more.
Adds up with others that can make you drowsy: , , , , , , , , , , , , , and 19 more.
The honest take
GABA is a real calming chemical in the brain, which makes it an understandable starting point. What is missing is good proof that a pill raises brain GABA enough to ease stress or improve sleep. Human studies so far are small and mixed. Do not mix it with sedatives or alcohol.
Sources
Each “See the research” link opens PubMed, the U.S. National Library of Medicine's index of medical studies, showing only trials and reviews done in people. The number tells you how much a use has been tested, not whether it worked. The proof rating tells you that.
Study counts checked October 2026.