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Amino Acid

L-Theanine

Also known as: Theanine

A
Evidence

Calming amino acid from tea that promotes relaxation without sedation. Synergistic with caffeine for focused calm.

Primary uses

  • Relaxation
  • Focus
  • Sleep support
  • Anxiety relief

How it works

  • Increases alpha brain waves
  • Modulates GABA, dopamine, serotonin
  • Crosses blood-brain barrier

Dosage

Typical range
100-400 mg daily
Timing
Any time; with caffeine for focus
With food
Optional
Duration
Safe long-term
Special populations
Anxious, need calm focus

Forms

  • Capsules
  • Powder
  • Tea

Safety

Common side effects

  • Very well tolerated

Contraindications

  • None

Known interactions

Evidence notes

Well-studied for calm focus

Grade A: Multiple well-designed human trials support the main claims.

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Medical disclaimer. This page is educational and does not replace advice from a qualified healthcare provider.