GABA
amino acids
GABA (gamma-aminobutyric acid) is an inhibitory neurotransmitter that promotes relaxation and reduces nervous system excitability. It is naturally produced in the brain but is also available as a supplement, though blood-brain barrier penetration remains limited.
Ready to try GABA?
Shop top-rated GABA supplements on Amazon UK
Affiliate link — we may earn a small commission at no extra cost to you.
Benefits
Dosage
Typical Dose
500-1000 mg
Upper Limit
3000 mg daily
Timing
30-60 minutes before sleep or as needed for anxiety
Forms & Bioavailability
Powder
Moderate; larger doses may increase absorption
Capsules
Moderate; convenient dosing but limited blood-brain barrier crossing
Tablets
Moderate; standard delivery method
Side Effects
Interactions
Research Summary
Research on oral GABA supplementation shows mixed results, primarily due to poor blood-brain barrier penetration. Some studies suggest modest benefits for anxiety and sleep, whilst other research indicates effects may be limited. More robust clinical trials are needed to establish efficacy and optimal dosing protocols.
Compare GABA with...
The Bottom Line on GABA
GABA is moderately researched with promising but sometimes mixed evidence.It is most commonly used for promotes relaxation and calm and may reduce anxiety symptoms. As with any supplement, individual results vary. Start with the lower end of the dosage range and assess for 4-8 weeks before adjusting.
About Our Research
This profile is compiled from peer-reviewed research published on PubMed, the NIH Office of Dietary Supplements, and established nutritional science databases. Dosages reflect clinically-studied amounts from human trials where available. We update profiles as new research emerges. This is not medical advice — consult a healthcare professional before supplementing.
Top Rated GABA on Amazon UK
We recommend choosing products with 4+ star ratings and verified reviews. Look for third-party tested brands.
Affiliate links — we earn a small commission at no extra cost to you.
Where to Buy GABA
We recommend buying from reputable retailers. Check reviews and third-party testing.
Affiliate links — we may earn a commission at no extra cost to you.
Shop From Our Partners
Amazon UK
Browse GABA supplements
Tonic Health
Vitamin C, D3 & Zinc sachets
NAD Direct
NAD+ & cellular health
Space Goods
Nootropic mushroom blends
Affiliate links — we may earn a commission at no extra cost to you.