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Could a daily vitamin d drop sharpen athletic edge?

NCT ID NCT07748650

Disease control Sponsor: Fu Jen Catholic University Hospital 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 Results may not be published yet.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This status has not been confirmed recently, so it may be out of date.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 06, 2026 · Last updated Aug 07, 2026 · Updated 1 time

Summary

This trial tests whether taking vitamin D3 daily, alone or with calcium, can improve sports performance in female indoor athletes. Over 90 days, participants receive either vitamin D3, vitamin D3 plus calcium, or a placebo, and researchers measure changes in muscle strength, balance, jump height, agility, and sprint speed. The goal is to see if this simple supplement can give athletes a measurable edge.

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) drops, with or without calcium tablets, compared to placebo
What this could lead to
If vitamin D3 improves muscle strength and balance, it could point to a simple supplement strategy for enhancing athletic performance in indoor athletes.
What could go wrong
This is a small, early-stage trial, so results may not apply broadly. Vitamin D may not outperform placebo, and high doses could carry risks.

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

37 people

The number who actually took part.

Started

Jul 2021

Finished

Dec 2022

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

20 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: * Athletes in Taiwan's top corporate league or semi-professional league that has been training and competing indoors for a long time. Exclusion Criteria: * Under 20 years old * Pregnant * Being in vulnerable groups such as prisoners or mentally handicapped, disabled, etc. * Had skeletal muscle-related injuries or surgeris * Have kidney and/or liver disease, lipid malabsorption of calcium and vitamin * Having organ stones * Have taken supplments and/or calcium and/or vitamin D and/or other related health foods within two weeks

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As listed by the trial registrant

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

Female indoor athletes

Contacts and locations

Locations

  • Fu Jen Catholic University Hospital

    New Taipei City, Taiwan