Caffeine and L-Theanine
People mainly take Caffeine and L-Theanine for focus, energy. Based on 6 first-hand reports. Ranked #362 of 3,539 overall.
Of reports that state an outcome, 83% are positive.
What Caffeine and L-Theanine does, according to users
Of the people who reported each effect, the share who said it got better.
What the research says
Systematic reviews and meta-analyses from PubMed, with their published conclusions.
Dosage people report
As stated by users — not a recommendation. Follow the label or your doctor.
Reported side effects
How often each side effect came up across all reports.
What users say
First-hand experiences, quoted verbatim. We show one positive and one negative where both exist.
“Caffiene and L-Theanine have worked well for me when I needed to gain focus on a task for the next several hours”
“I made the mistake of taking a bit too many caffeine+theanine pills - I took three within 6 hours. It gave my stomach some real issues”
“By far the most effective and worthwhile combo of nootropics I've tried...focused alertness...haven't crashed either.”
“I have had some success with caffeine and theanine.”
Top discussions (5)
Other options for focus
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 3, 2026. How we rate