L-Theanine vs L-Tryptophan for sleep
Short answer: For sleep, more users report improvement with L-Tryptophan — 89% of 54 reports, versus 78% of 370 for L-Theanine.
L-Theanine has 18 meta-analyses and 78 randomized trials on PubMed; L-Tryptophan has 18 and 117.
Based on 3,475 reports about L-Theanine and 238 about L-Tryptophan. Not medical advice.
| L-Theanine Supplement | L-Tryptophan Supplement | |
|---|---|---|
| Users say it helped | 65%helped1,807 reports · high confidence | 61%helped67 reports · medium confidence |
| Verdict | Mostly positive | Mostly positive |
| Research | AResearch: Strong | AResearch: Strong |
| Meta-analyses / RCTs | 18 / 78 | 18 / 117 |
| Mainly used for | ||
| Anxiety % reporting improvement | 91% (1289) | 77% (13) |
| Focus % reporting improvement | 88% (501) | — |
| Sleep % reporting improvement | 78% (370) | 89% (54) |
| Mood % reporting improvement | 77% (223) | 95% (37) |
| Energy % reporting improvement | 68% (97) | — |
| Common side effects | drowsiness, vivid dreams, fatigue, headache | drowsiness, vivid dreams, death, anxiety |
| Typical dose reported | 200 mg / bedtime | 1000 mg / before sleep |
This meta-analysis provides evidence that theanine plus caffeine, and theanine alone, could be beneficial for cognitive and mood outcomes. More research using tea beverages or tea-equivalent bioactive doses and research in free-living participants is needed.
Nutr Rev, 2025 ↗“This morning was my first time taking this combination along with my other daily vitamins and wow, what a difference it has made in my overall mood and anxiety!”
Trp supplementation, especially at ≥1 g can help improve sleep quality.
Nutr Rev, 2022 ↗“L-Tryptophan has given me the most relaxation / anti-anxiety out of the aminos I've tried.”
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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