Skip to main content

Amino Acid

Theanine

Also known as: L-Theanine

A
Evidence

Amino acid from tea promoting calm focus without drowsiness. Alpha brain waves.

Primary uses

  • Anxiety relief
  • Calm focus
  • Stress
  • Sleep quality
  • Focus
  • Calm energy
  • Caffeine synergy

How it works

  • Increases alpha brain waves
  • Boosts GABA, serotonin, dopamine
  • Counteracts caffeine jitters

Dosage

Typical range
100-400mg
Timing
As needed or with caffeine
With food
Either
Duration
Safe for regular use
Special populations
Caffeine users, daytime anxiety

Forms

  • Capsule
  • Suntheanine
  • Powder

Safety

Common side effects

  • Very well tolerated

Contraindications

  • None known

Known interactions

Evidence notes

Strong evidence for stress and anxiety

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

Related in Amino Acid

Check a full stack

Formulate's free interaction checker lets you paste in any combination of supplements and medications at once — every pairing flags severity, timing, and cited evidence.

Open the checker

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