Found naturally in green tea, L-theanine promotes alpha brain waves, the same calm-yet-alert state achieved during meditation.
The Science of Alpha Waves
L-theanine crosses the blood-brain barrier within 30 minutes. It increases GABA, serotonin, and dopamine simultaneously, inducing a state of relaxed alertness.
Sleep Onset Benefits
In a 2011 study, 200mg of L-theanine before bed reduced sleep latency by 15 minutes in participants with anxiety. Unlike sedatives, it doesn’t knock you out.
Synergy with Caffeine Users
Ironically, L-theanine pairs with caffeine during the day. If you drink coffee late afternoon, 100mg theanine can counteract caffeine’s half-life effect.
Optimal Dosing
For sleep: 200-400mg, 30-60 minutes before bed. For racing thoughts: 200mg upon waking and 200mg before bed. Theanine is extremely well-tolerated.
Verdict:L-theanine is ideal for anxiety-related insomnia and racing thoughts. It won’t sedate you, but it quiets the mental noise that prevents sleep onset.