L-Theanine + Caffeine
People mainly take L-Theanine + Caffeine for focus, anxiety, energy. Based on 16 first-hand reports. Ranked #277 of 1,974 overall.
36
User score
Mostly positive50% positive19% mixed6% negative25% unclear
Of reports that state an outcome, 67% are positive.
Clinical research
Research pending
What L-Theanine + Caffeine does, according to users
Of the people who reported each effect, the share who said it got better.
2 more with fewer than 3 reports
betterno changeworse
What the research says
Systematic reviews and meta-analyses from PubMed, with their published conclusions.
Research data for L-Theanine + Caffeine is being compiled.
Dosage people report
As stated by users — not a recommendation. Follow the label or your doctor.
2:1 ratioas reported
100 mg caffeine, 200 mg l-theaninedaily
100 mg caffeine + 100-200 mg l-theanine3-4 days/week
250-500 mg l-theanine; 75 mg caffeinedaily
Reported side effects
How often each side effect came up across all reports.
emotional dulling ×1addiction ×1fatigue ×1mental slowness ×1
What users say
Verbatim quotes, shortened only — each links to the original discussion.
“We already did L-Theanine + caffeine that went well”
“emotional dulling I get from stronger focus promoters like 200mg modafinil or 2:1 L-theanine + caffeine”
“L-Theanine + Caffeine. Shit builds careers.”
“I can take L-Theanine with Caffeine without any problem”
“It’s just okay. I would say it has about 10% of the effect you would expect and it lasts for like, 3 hours per day tops.”
Top discussions (5)
- L Theanine cured my ( social) anxiety. I'm blown away. I'm usually socially awkward but I MASTERED a job interview. ↗
- L-theanine and Caffeine Improve Sustained Attention, Impulsivity and Cognition in Children with Attention Deficit Hyperactivity Disorders by Decreasing Mind Wandering - PUBMED 2019. ↗
- L-theanine+Caffeine is f*cking amazing ↗
- What’s the worst supplement hype you’ve fallen for? ↗
- Sleepiness during the day, fatigue, mental fog ↗
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User data from public discussions; research from PubMed. Information only, not medical advice — talk to a doctor before starting, stopping or combining anything. Data updated October 2, 2026. How we rate