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Iron pills may give female footballers a performance edge

NCT ID NCT04526678

Disease control Sponsor: Norwegian University of Life 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 Results may not be published yet.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This status has not been confirmed recently, so it may be out of date.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 Aug 11, 2026 · Last updated Aug 12, 2026 · Updated 1 time

Summary

This pilot study looks at whether a daily low-dose iron supplement (27 mg for three months) can improve iron status, gut health, and endurance in young female elite football players. Researchers will track diet, blood markers like hemoglobin and ferritin, gut leakage indicators, and performance on a football-specific endurance test. The goal is to see if simple iron supplementation can help these athletes maintain healthy iron levels and potentially enhance their performance.

What this could mean

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

Active substance
Iron supplement (27 mg daily)
What this could lead to
If effective, daily low-dose iron could help young female athletes maintain healthy iron levels, potentially boosting endurance and overall performance.
What could go wrong
This is a small pilot study, so results may not apply broadly. Iron supplements can cause digestive discomfort, and the effect on performance is not guaranteed.

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

23 people

The number who actually took part.

Started

Aug 2020

Finished

Dec 2020

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

16 years and older

Sex

Female 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: \- Female elite football players from two selected football clubs Exclusion Criteria: * Pregnancy * Medical conditions that are worsened by taking iron supplements * Already taking iron supplements

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Conditions

The condition(s) this trial relates to.

tinea pedis

As listed by the trial registrant

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

Athletes Endurance performance Hemoglobin Intestinal health IRON Microbiota

Contacts and locations

Locations

  • Norwegian University of Life Sciences

    Ås, 1433, Norway

More trials for these conditions

Other studies related to the condition(s) this trial covers.