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L-theanine

Also called: Theanine, Suntheanine

A calming amino acid from tea leaves. It may ease stress and support relaxed focus without making you drowsy.

Supplements can interact with medications and aren't right for everyone, especially during pregnancy or breastfeeding, or with a chronic condition. Ask your provider before you start.

Studied for

  • Stress and a busy mind
  • Calm focus
  • Sleep quality
  • Smoothing out coffee jitters

Found naturally in

  • Green tea
  • Matcha
  • Black tea
  • White and oolong tea
What variations of L-theanine exist?Our top pick, what to skip, and how to read the label

Label red flags

  • Lists 'theanine' without specifying the L-form
  • Calming blends that combine many sedating herbs

Check with a provider

  • Pregnancy or breastfeeding (not well studied)
  • Taking blood pressure medicines, since it may lower blood pressure slightly
  • Taking sedatives or sleep medicines

Supplements that contain it

8 products in Dr. Lesher's dispensary list l-theanine on the label.

Check with your provider before taking any of these, especially if you're pregnant or take medications.

Parts of the body it affects

Explore what each area does and the conditions that can affect it.

Illustration of the human brain

Brain & nerves

Your brain, spinal cord, and nerves carry every signal in your body, from movement and sensation to mood and memory.

Illustrations: Servier Medical Art, CC BY 4.0

Dr. Lesher, ND

Ready to find the root cause?

Dr. Lesher is a Naturopathic Doctor who focuses on autoimmune and chronic conditions in women. Since 2020, she's helped hundreds of patients stop managing symptoms and start healing.

Book a consult now