L-Carnitine: a natural boost for Post-Workout recovery?
NCT ID NCT07492446
First seen Jun 27, 2026 · Last updated Jun 27, 2026
Summary
This study looked at whether taking L-carnitine supplements for 21 days can reduce muscle damage and soreness after high-intensity interval training in young male athletes. Thirty healthy athletes took either L-carnitine or a placebo, and researchers measured blood markers of muscle damage and self-reported pain. The goal is to see if this common supplement can speed up recovery and improve performance.
What this could mean
Our plain-language read of the trial. This is informational only, not medical advice or a prediction.
- Active substance
- L-carnitine (dietary supplement)
- What this could lead to
- If it works, this could point toward a simple supplement to help athletes recover faster from intense workouts.
- What could go wrong
- This is a small, completed study with only 30 participants, so results may not apply to everyone. The supplement may have little effect due to low absorption.
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
-
30 people
The number who actually took part.
- Started
-
May 2025
- Finished
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Jun 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 25 years
- Sex
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Male participants only
- Healthy volunteers
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Accepted
You do not need to have the condition being studied to take part.
Show the full entry requirements Hide 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: * Male athletes aged 18-25 years * Regularly participating in organized sports training for at least 3 days per week * Healthy individuals with no diagnosed cardiovascular, metabolic, or musculoskeletal disorders * Willingness to comply with the supplementation protocol for 21 days * Agreement to refrain from consuming foods rich in carnitine (e.g., meat and dairy products) during the supplementation period * Agreement to avoid unfamiliar or strenuous exercise, particularly resistance exercise involving eccentric contractions, for one week prior to the experimental protocol * Provision of written informed consent to participate in the study Exclusion Criteria: * Use of dietary supplements (including L-carnitine) within the last 3 weeks * Presence of musculoskeletal injury or chronic disease that may affect exercise performance * Use of medications that may influence muscle metabolism or recovery * Known allergy or intolerance to the supplement components * Failure to comply with the dietary or supplementation protocol * Participation in another clinical or exercise intervention study during the study period * Any condition deemed unsuitable for participation by the research team
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Conditions
The condition(s) this trial relates to.
As listed by the trial registrant
The condition terms exactly as the trial's registrant entered them.
Contacts and locations
Locations
-
Istanbul Sabahattin Zaim University, Faculty of Sports Sciences
Istanbul, Küçükçekmece, 34303, Turkey (Türkiye)
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