The Effect of the Amino Acid L-Theanine on Alertness and Vigilance

The University of Texas Health Science Center, Houston26 enrolled

Overview

The amino acid l-theanine (the active ingredient in green tea) is considered to have a calming effect without causing sleepiness. This study evaluates whether l-theanine affects blood pressure, heart rate, alertness, and sense of well-being.

Study Type

INTERVENTIONAL

Allocation

RANDOMIZED

Purpose

TREATMENT

Masking

DOUBLE

Enrollment

Conditions

Theanine, (L)-Isomer

Interventions

L-theanine capsuleDIETARY_SUPPLEMENT

L-theanine 250mg capsule

Placebo capsuleDIETARY_SUPPLEMENT

Eligibility

Sex: ALLMin age: 18 YearsHealthy volunteers:

Medical Language ↔ Plain English

Inclusion Criteria: * adult * able to swallow capsule Exclusion Criteria: * none

Locations (1)

Physicians at Sugar Creek

Sugar Land, Texas, United States

Outcomes

Primary Outcomes

Alertness

The average response time to identify a small rectangle shown on a computer screen.

Time frame: 48 hrs

Alertness

Degree of subjective alertness, measured on a visual analog scale

Time frame: 48 hrs

Well-Being

Sense of subjective well-being as measured on a visual analog scale

Time frame: 48 hrs

Data from ClinicalTrials.gov

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