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

The University of Texas System (UT)

Status: Completed

Conditions: Theanine, (L)-Isomer

Treatments: Dietary Supplement: L-theanine capsule; Dietary Supplement: Placebo capsule

Study type: Interventional

Funder types: Other

Identifiers

NCT01851122

HSC-GEN-11-0299

Details and patient eligibility

About

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.

Enrollment: 26 patients

Sex: All

Ages: 18+ years old

Volunteers: Accepts Healthy Volunteers

Inclusion criteria

• adult
• able to swallow capsule

Exclusion criteria

• none

Trial design

Primary purpose: Treatment

Allocation: Randomized

Interventional model: Crossover Assignment

Masking: Double Blind

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26 participants in 2 patient groups, including a placebo group

Placebo capsule

Placebo Comparator group

Treatment:

Dietary Supplement: Placebo capsule

L-theanine capsule

Experimental group

Treatment:

Dietary Supplement: L-theanine capsule