Supplement
GABA
SaveGamma-aminobutyric acid is the primary inhibitory neurotransmitter in the brain. Oral supplements may have limited blood-brain barrier penetration, though some users report calming effects.
Quick verdict
Oral GABA has questionable CNS bioavailability; calming effects may be partly peripheral or placebo-mediated.
Evidence score
A rough internal score reflecting quantity, quality, and consistency of human evidence. Not a clinical recommendation.
What the research shows
Most evidence for anxiolytic effects comes from small trials. Whether oral GABA meaningfully crosses the blood-brain barrier remains debated. Some studies suggest peripheral GABAergic signaling may contribute to subjective relaxation.
Benefits
- May reduce subjective anxiety and stress
- Some evidence for improved sleep onset
- Generally well-tolerated at typical doses
Dosage notes
Typical doses range from 100-750 mg daily, often taken before bed or during stressful periods.
Side effects
- Drowsiness
- Tingling or flushing at higher doses
- Mild GI discomfort
Who should be cautious
May cause drowsiness. Avoid combining with sedatives or alcohol. Not recommended during pregnancy.
What this page cannot tell you
Blood-brain barrier permeability of oral GABA is poorly established. Many positive studies are industry-funded or small.
Leaderboard scores
- Sleep38
- Anxiety35
- Stress30
- Mood25
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