Strong evidenceamino_acid
L-Theanine for Stress
L-theanine increases alpha brain wave production (8-14 Hz), creating a relaxed-but-alert mental state. It reduces cortisol and enhances GABA activity, counteracting the physiological effects of acute and chronic stress.
How strong is the research?
Strong evidence
Based on a randomised controlled trial (RCT) — the gold standard for establishing cause and effect.
Research source
SourceHidese S et al. · Nutrients 2019How much to take
200–400 mg
Works within 30-40 minutes for acute stress. Can be combined with ashwagandha for comprehensive stress support.