L-Theanine vs L-Theanine + Caffeine for focus
Short answer: For focus, more users report improvement with L-Theanine + Caffeine — 95% of 19 reports, versus 88% of 501 for L-Theanine.
L-Theanine has 18 meta-analyses and 78 randomized trials on PubMed; the other has not been graded.
Based on 3,475 reports about L-Theanine and 33 about L-Theanine + Caffeine. Not medical advice.
| L-Theanine Supplement | L-Theanine + Caffeine Supplement | |
|---|---|---|
| Users say it helped | 65%helped1,807 reports · high confidence | 64%helped22 reports · medium confidence |
| Verdict | Mostly positive | Mostly positive |
| Research | AResearch: Strong | Not graded |
| Meta-analyses / RCTs | 18 / 78 | — |
| Mainly used for | ||
| Anxiety % reporting improvement | 91% (1289) | 100% (5) |
| Focus % reporting improvement | 88% (501) | 95% (19) |
| Sleep % reporting improvement | 78% (370) | — |
| Mood % reporting improvement | 77% (223) | 67% (3) |
| Energy % reporting improvement | 68% (97) | 71% (7) |
| Common side effects | drowsiness, vivid dreams, fatigue, headache | emotional dulling, addiction, fatigue, mental slowness |
| Typical dose reported | 200 mg / bedtime | 100 mg caffeine, 200 mg l-theanine / daily |
L-TheanineFull L-Theanine profile →
Latest review conclusion
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 ↗What a user said
“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!”
L-Theanine + CaffeineFull L-Theanine + Caffeine profile →
What a user said
“Theanine and coffe gave me a focus I cant describe. Like 'on it!'. On the line.”
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