Cross-reference to l-theanine.md. Suntheanine® is the branded form used in most studies. 100-200mg promotes alpha brain waves (calm focus) within 30-45 minutes. The L-theanine + caffeine stack is the most studied nootropic combination — synergistic for focus without jitters. --- *Reviewed by the Dose AI Research Team and Clinical Advisory Board* *Last updated: 2026-04-06*
Reviewed by the Scan Dose Research Team and Clinical Advisory Board | Last updated:
Not medical advice. Based on published clinical research and systematic reviews.