Source: Examine.com — GABA — Human evidence is limited; relaxation studies used ~100–800 mg.
Oral GABA evidence is weak; sleep studies cluster around 100–300 mg.
The brain's main inhibitory neurotransmitter, sold as a calming supplement.
Acts on GABA receptors — but oral GABA crosses the blood-brain barrier poorly, so much of the effect may be peripheral or placebo.
Safe. Can cause flushing or tingling. Honest note: oral efficacy is debated; theanine, glycine or magnesium are better-supported for calm.
| Per serving | |
|---|---|
| Typical branded single-ingredient product | $0.33 |
| Bulk powder at the clinical dose (250g, $19.97) | $0.02 |
Buying bulk powder instead of a branded bottle saves about 93% per serving.
Bulk price: $19.97/250g → Alt source: $8.99/250gEducational only — not medical advice. Grades and clinical doses are computed from public labels against sourced research (citations on the main site); prices last verified 2026-07-21. Expensive Powder has no sponsors; bulk links may earn an affiliate commission, which never affects a grade. Talk to a clinician before starting any supplement.