GABA vs L-Tryptophan for sleep
Short answer: For sleep, more users report improvement with L-Tryptophan — 89% of 54 reports, versus 80% of 104 for GABA.
GABA has 8 meta-analyses and 26 randomized trials on PubMed; L-Tryptophan has 18 and 117.
Based on 470 reports about GABA and 238 about L-Tryptophan. Not medical advice.
| GABA Supplement | L-Tryptophan Supplement | |
|---|---|---|
| Users say it helped | 40%helped226 reports · high confidence | 61%helped67 reports · medium confidence |
| Verdict | Mixed | Mostly positive |
| Research | AResearch: Strong | AResearch: Strong |
| Meta-analyses / RCTs | 8 / 26 | 18 / 117 |
| Mainly used for | ||
| Sleep % reporting improvement | 80% (104) | 89% (54) |
| Anxiety % reporting improvement | 80% (122) | 77% (13) |
| Mood % reporting improvement | 67% (21) | 95% (37) |
| Energy % reporting improvement | 33% (6) | — |
| Common side effects | drowsiness, vivid dreams, fatigue, shortness of | drowsiness, vivid dreams, death, anxiety |
| Typical dose reported | 1500 mg / nightly | 1000 mg / before sleep |
GABAFull GABA profile →
Latest review conclusion
The results provide plausible evidence for the positive role of zinc in the treatment of patients afflicted with anxiety, albeit with some limitations.
Nutr Rev, 2024 ↗What a user said
“I take 1.5mgs with 1500mg GABA-A Acid I have insane dreams every night and sleep like a baby.”
L-TryptophanFull L-Tryptophan profile →
Latest review conclusion
Trp supplementation, especially at ≥1 g can help improve sleep quality.
Nutr Rev, 2022 ↗What a user said
“L-Tryptophan has given me the most relaxation / anti-anxiety out of the aminos I've tried.”
Related comparisons
Percentages come from first-hand user reports and are not clinical outcomes. Talk to a doctor before starting, stopping or combining anything. How we rate