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Footballers get mega vitamin d dose in exercise study

NCT ID NCT07310329

Knowledge-focused Sponsor: Wroclaw University of Health and Sport Sciences 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 Results may not be published yet.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This status has not been confirmed recently, so it may be out of date.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 pilot study gave 20 professional football players either a single high dose of vitamin D or a placebo before a match. Researchers measured how vitamin D levels changed in their blood. The goal was to see how exercise affects vitamin D metabolism, not to treat any disease.

What this could mean

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

Active substance
Vitamin D₃ (cholecalciferol)
What this could lead to
If successful, this could help understand how exercise and vitamin D interact in athletes, possibly guiding future supplementation strategies.
What could go wrong
This is a very small pilot study in healthy athletes, not designed to test health outcomes. Results may not apply to the general population.

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

Apr 2024

Finished

Jun 2024

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 35 years

Sex

Male participants only

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: 1. Male professional football players aged 18-35 years 2. Actively training and competing in the Polish first football league 3. No vitamin D or calcium supplementation during the previous 3 months 4. No injuries or illnesses affecting participation Exclusion Criteria: 1. Current musculoskeletal injury or illness 2. Chronic metabolic, endocrine, or renal disorders 3. Use of vitamin D or calcium supplements 4. Refusal or inability to sign informed consent

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Conditions

The condition(s) this trial relates to.

tinea pedis vitamin D deficiency

As listed by the trial registrant

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

Athletes Exercise physiology Football players Vitamin D deficiency (10 NG/ML to 30 NG/ML)

Contacts and locations

Locations

  • Wroclaw University of Health and Sport Sciences

    Wroclaw, Dolnyśląsk, 51-612, Poland

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