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

> **NCT01851122** · NA · COMPLETED · sponsor: **The University of Texas Health Science Center, Houston** · enrollment: 26 (actual)

## Conditions studied

- Theanine, (L)-Isomer

## Interventions

- **DIETARY_SUPPLEMENT:** L-theanine capsule
- **DIETARY_SUPPLEMENT:** Placebo capsule

## Key facts

- **NCT ID:** NCT01851122
- **Lead sponsor:** The University of Texas Health Science Center, Houston
- **Sponsor class:** OTHER
- **Phase:** NA
- **Study type:** INTERVENTIONAL
- **Status:** COMPLETED
- **Start date:** 2011-11
- **Primary completion:** 2012-10
- **Final completion:** 2012-10
- **Target enrollment:** 26 (ACTUAL)
- **Last updated:** 2023-12-13


## Primary source

ClinicalTrials.gov registry: https://clinicaltrials.gov/study/NCT01851122

## Citation

> US National Library of Medicine, ClinicalTrials.gov registration NCT01851122, "The Effect of the Amino Acid L-Theanine on Alertness and Vigilance". Retrieved via AI Analytics 2026-06-02 from https://api.ai-analytics.org/clinical/NCT01851122. Licensed CC0.

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*[Clinical trials dataset](/datasets/clinical-trials) · CC0 1.0*