COGNITIVE FUNCTION & STRESS RESPONSE - RŌNIN V4.1
Why 200mg of L-Theanine?
Promotes alpha brain wave activity - the neurological signature of calm alertness without sedation. Works synergistically with the 66mg natural caffeine from matcha for smooth, sustained energy with no crash.
- CATEGORY
- Cognitive & Stress
- DOSE
- 200mg
- FORM
- L-isomer - Suntheanine chirally verified
- EVIDENCE LEVEL
- Strong - multiple human EEG/RCT studies
How L-Theanine works
L-theanine is an amino acid found almost exclusively in tea (Camellia sinensis). It readily crosses the blood-brain barrier and modulates inhibitory neurotransmitter activity, increasing alpha brain wave (8-12 Hz) power - the EEG signature of relaxed, focused alertness.
The theanine-caffeine combination is among the most well-studied cognitive stacks. Theanine attenuates the anxiety-inducing and blood pressure-raising effects of caffeine while preserving its alertness and attention-enhancing properties. This formula contains both: 200mg Suntheanine plus ~66mg natural caffeine from matcha, with ~40mg additional theanine co-occurring in the matcha itself.
Key benefits
- Increases alpha brain wave activity - calm, focused alertness
- Co-occurs naturally with caffeine in Camellia sinensis and has been studied in combination
- Synergistic with caffeine for sustained attention
- No sedation at standard doses
- Suntheanine: chirally pure L-isomer with highest bioavailability
The research
Peer-reviewed human trials supporting this ingredient at this dose.
- L-theanine, a natural constituent in tea, and its effect on mental state.PubMed →
- The combined effects of L-theanine and caffeine on cognitive performance and mood.PubMed →
- Effects of L-theanine administration on stress-related symptoms and cognitive functions in healthy adults: a randomized controlled trial.PubMed →
IN THE FORMULA
L-Theanine
200mg
Free-form amino acid
WHEN TO TAKE IT
Any time of day. The synergy with caffeine is strongest when taken simultaneously with matcha. Can be taken alone in the evening for calm without sedation.