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L-Theanine
Also known as: Theanine, γ-glutamylethylamide
Amino Acid
NootropicT1Full ProfileAcute
B
Tier B
Multiple RCTs (n>100)
Amino acid from tea that promotes calm focus without sedation. Synergizes exceptionally well with caffeine.
Mechanism of Action
Increases GABA, serotonin, and dopamine levels. Enhances alpha brain wave activity associated with relaxed alertness.
Usage Tips
- Stack with caffeine for synergistic focus
- Can be taken any time of day
- No tolerance buildup - safe for daily use
- Green tea provides ~25mg per cup naturally
Contraindications
- None known at typical doses
Performance Profile
Mood
+2
Stress Resistance
+3
Anxiety Reduction
+4
Emotional Stability
+3
Dosage
100mg
min
200mg
400mg
max
Timing
Best time
Anytime
30 min
onset
5 hr
duration
Half-life
3 hrSafety & Legal
10/10
Well-tolerated
Legal Status
OTC
Mild
Moderate
Severe
Drowsiness
0.1-1%mild
Headache
<0.1%mild