Theanine

Written by:

Bill Willis, Thomas Solomon

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•Last Updated: September 27, 2023

Theanine, also commonly referred to as L-theanine, is a naturally occurring amino acid found in tea. Supplementation with L-theanine may help reduce stress and anxiety and might improve sleep quality and some aspects of cognitive function.

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Last Updated:September 27, 2023

Overview

What is L-theanine?

What are L-theanine’s main benefits?

What are L-theanine’s main drawbacks?

How does L-theanine work?

Dosage information

Clinical studies typically use L-theanine at a dosage of 100–400 milligrams (mg) per day.

Frequently asked questions

What is the effect of combining L-theanine with caffeine?

What are other names for Theanine?

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References

Examine Database: Theanine

The conditions below have no primary outcomes

Cognitive Improvement

4 primary outcomes

B

20 Studies

Focus & Attention

1 primary outcome

4 Studies

1 primary outcome

4 Studies

Mental Resilience

3 primary outcomes

6 Studies

1 primary outcome

10 Studies

General Cardiovascular Health

1 primary outcome

3 Studies

1 primary outcome

1 Study

1 primary outcome

1 Study

1 primary outcome

1 Study

Aerobic Exercise Performance

1 primary outcome

1 Study

Schizoaffective Disorder

1 primary outcome

1 Study

Mood Improvement

0 outcomes

-

4 Studies

0 outcomes

2 Studies

Attention Deficit Hyperactivity Disorder

0 outcomes

1 Study

Metabolic Health

0 outcomes

1 Study

General Athletic Performance

0 outcomes

1 Study

Cognitive Improvement

Focus & Attention

Mental Resilience

General Cardiovascular Health

Aerobic Exercise Performance

Schizoaffective Disorder

The conditions below have no primary outcomes

Mood Improvement

Attention Deficit Hyperactivity Disorder

Metabolic Health

General Athletic Performance