Effects of L-Theanine in Boys With ADHD

A Double Blind, Randomized Placebo Controlled Clinical Trial Examining the Effects of L-Theanine (Suntheanine®) in Male Child Subjects With Attention Deficit Hyperactivity Disorder

Status

Completed

Phases

Phase 2

Study type

Interventional

Source

ClinicalTrials.gov

Registry ID

NCT00291070

Enrollment

100

Registered

2006-02-13

Start date

2005-10-31

Completion date

2006-07-31

Last updated

2008-05-06

For informational purposes only — not medical advice. Sourced from public registries and may not reflect the latest updates. Terms

Conditions

Attention Deficit Hyperactivity Disorder

Keywords

ADHD, attention, insomnia, hyperactivity, anxiety

Brief summary

This study will examine the effects of L-theanine (an amino acid found in green tea) on the behavior, cognitive performance and sleep quality of boys with ADHD.

Interventions

DRUGL-theanine

This study will examine the effects of L-theanine (an amino acid found in green tea) on the behavior, cognitive performance and sleep quality of boys with ADHD.

Study design

Allocation

RANDOMIZED

Intervention model

PARALLEL

Primary purpose

TREATMENT

Masking

DOUBLE (Subject, Investigator)

Eligibility

Sex/Gender

MALE

Age

8 Years to 12 Years

Healthy volunteers

Inclusion criteria

Diagnosis of attention deficit hyperactivity disorder (ADHD)

Exclusion criteria

Design outcomes

Primary

Measure	Time frame
Cognitive performance	—

Secondary

Measure	Time frame
Sleep quality, hyperactive behaviors, anxiety	—

Countries

Canada

Outcome results

None listed

Source: ClinicalTrials.gov · Data processed: Feb 4, 2026