Cognitive & Focus

L-Theanine: Benefits, Dosage & What the Science Says

Amino acid from tea leaves associated with relaxation and alpha-wave activity without sedation.

Last reviewed: Moderate evidence

What Is L-Theanine?

Calm focus and relaxation without sedation

Evidence-Based Benefits

  • Relaxation without drowsiness
  • Focus enhancement
  • Sleep synergy with caffeine or GABA

Recommended Dosage

100–400 mg/day; often 200 mg for acute calm-focus.

Safety, Side Effects & Interactions

Well-tolerated; limited interactions reported.

Works Well With

Research suggests L-Theanine may complement:

Traditional Use

Traditional Chinese Medicine
绿茶 Lǜ Chá
clears heat promotes alertness benefits the mind resolves phlegm

View herb profile on NaturalHerbLibrary.com →

References

  1. Theanine and cognition — PMID:0001006

Last reviewed: April 20, 2026. For informational purposes only. See full disclaimer. These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.

AI & Developer Endpoint

/data/supplements/l-theanine.json

This supplement profile ships machine-readable JSON-LD and a structured data endpoint for AI systems and developers.