Caffeine vs Caffeine + L-Theanine for focus
Short answer: For focus, more users report improvement with Caffeine + L-Theanine — 91% of 66 reports, versus 83% of 568 for Caffeine.
Caffeine has 680 meta-analyses and 2,072 randomized trials on PubMed; the other has not been graded.
Based on 2,414 reports about Caffeine and 121 about Caffeine + L-Theanine. Not medical advice.
| Caffeine Substance | Caffeine + L-Theanine Supplement | |
|---|---|---|
| Users say it helped | 47%helped1,448 reports · high confidence | 78%helped77 reports · medium confidence |
| Verdict | Mixed | Mostly positive |
| Research | AResearch: Strong | Not graded |
| Meta-analyses / RCTs | 680 / 2,072 | — |
| Mainly used for | ||
| Energy % reporting improvement | 83% (908) | 82% (28) |
| Focus % reporting improvement | 83% (568) | 91% (66) |
| Anxiety % reporting improvement | 16% (240) | 100% (17) |
| Mood % reporting improvement | 74% (137) | 100% (6) |
| Sleep % reporting improvement | 15% (131) | — |
| Common side effects | jitteriness, anxiety, insomnia, headache | drowsiness, frequent urination, insomnia, nausea |
| Typical dose reported | 100-150 mg / daily | 400 mg caffeine / 800 mg l-theanine |
To avoid reductions in total sleep time, coffee (107 mg per 250 mL) should be consumed at least 8.8 h prior to bedtime and a standard serve of pre-workout supplement (217.5 mg) should be consumed at least 13.2 h prior to bedtime. The results of the present study provide evidence-based guidance for the appropriate consumption of caffeine to mitigate the deleterious effects on sleep.
Sleep Med Rev, 2023 ↗“Personally, I feel and function much better if I keep my caffeine intake very low to zero.”
“I was hit with a surge of focus and mental clarity that I have not experienced in a very very long time.”
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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