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Caffeine and L-Theanine: a dynamic duo for athletes?

NCT ID NCT07268573

Symptom relief Sponsor: Ulaş Can YILDIRIM Source: ClinicalTrials.gov ↗

What the study statuses mean

This study's is highlighted.

Recruitment status, easiest to join first

Recruiting now
This trial is taking on new participants right now.
Not yet recruiting
Registered, but not yet taking participants.
By invitation only
Not open to general applications. Only people the study team invites can take part.
Paused
Paused for now. It may or may not start again.
Ongoing
Running, but no longer taking on new participants.
Completed This study
The trial has finished. Results may not be published yet.
Stopped early
Stopped early, before it reached the end. That can be for many reasons, including safety.
Cancelled
Cancelled before anyone took part.

Expanded access (not trials)

Expanded access
Not a trial. This treatment can be requested outside a study, case by case, for people who qualify.
Expanded access (paused)
Not a trial. The treatment can normally be requested outside a study, but is unavailable right now.
Expanded access (ended)
Not a trial. The treatment could once be requested outside a study, but no longer can.
Approved
The treatment has been approved, so it is available normally rather than through this programme.

When the status isn't known

Details not published
The full record has not been published yet, so there is little to show here.
Status unknown
This status has not been confirmed recently, so it may be out of date.

First seen Jun 27, 2026 · Last updated Jun 27, 2026

Summary

This study looked at how caffeine and L-theanine, taken alone or together, affect physical and cognitive performance in 20 competitive athletes. Participants completed strength, endurance, and coordination tests after taking supplements or a placebo. The goal was to see if these common ingredients could enhance performance.

What this could mean

Our plain-language read of the trial. This is informational only, not medical advice or a prediction.

Active substance
caffeine and L-theanine
What this could lead to
If it works, this could show that combining caffeine and L-theanine boosts strength, endurance, and coordination in athletes.
What could go wrong
This is a small, completed study with only 20 athletes, so results may not apply to everyone. Caffeine can cause jitters or sleep issues in some people.

This is an AI summary of the original study and may miss details. Read our disclaimer.

Study facts

What this study's own registry entry says, in plain language.

Phase

Not a phased trial

Phase numbers describe drug development. The registry uses this when they do not apply, as it does for trials of devices, procedures or behaviour changes, and for observational studies.

Participants

20 people

The number who actually took part.

Started

Aug 2025

Finished

Aug 2025

Lead sponsor

Other sponsor

The registry's catch-all category, for sponsors it does not file as a company, a government agency, or a research network.

Who can take part

This study's own entry requirements. Only the study team can say for certain whether you qualify.

Ages

18 to 30 years

Sex

Anyone

Healthy volunteers

Accepted

You do not need to have the condition being studied to take part.

Show the full entry requirements

Copied word for word from the study's registry entry, so the wording is the study team's rather than ours.

Inclusion Criteria: * Active participation in individual or team sports at a competitive level * Age between \[insert range, e.g., 18-30\] years * Absence of any known medical or metabolic disorder Exclusion Criteria: * History of cardiovascular, neurological, or musculoskeletal disorders within the past 12 months * Known intolerance or hypersensitivity to caffeine or theanine * Allergy to mannitol or other excipients used in capsule formulation * Current use of prescription medications * Physician-directed restriction of caffeine or theanine consumption.

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As listed by the trial registrant

The condition terms exactly as the trial's registrant entered them.

Caffeine and L-theanine interaction Cognitive performance Physical performance enhancement

Contacts and locations

Locations

  • Sinop University Facility

    Sinop, Centarl, 57100, Turkey (Türkiye)

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