TargetedSleep, stressVegan form available
L-theanine
Green tea's calming amino acid: small RCTs show less stress and better sleep, and sharper focus with caffeine.
2/5· Small human trialsEstimated monthly cost: ≈ 6 €
Dose
100–200 mg; 100–200 mg with coffee.
Timing
Evening or with coffee.
⚠ Cautions
May add to blood-pressure medication.
What it is
Boosts alpha-wave activity, modulates GABA and glutamate.
What the evidence shows
200 mg/day for 4 weeks improved stress, sleep and cognitive scores in healthy adults (n=30). With caffeine it improves attention without the jitters.
Goals
SleepBrain, memory
Last reviewed: 6 September 2026
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