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Winter vitamin d fix: fortified foods tested on teens

NCT ID NCT07349290

Knowledge-focused Sponsor: University of Ulster Source: ClinicalTrials.gov ↗

What the study statuses mean

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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 This study
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
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 Results may not be published yet.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This status has not been confirmed recently, so it may be out of date.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 looks at whether giving families foods naturally rich or fortified with vitamin D can improve vitamin D levels in teenagers during winter. About 160 households with at least one teen (11-17) and one adult will take part. Researchers will measure vitamin D in blood and ask about diet and food preferences.

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

About 160 people

The number the study aims to enrol. It can still change while the study runs.

Started

Feb 2026

Expected to finish

Apr 2027

An estimate. End dates often move.

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

4 years and older

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: * Households with at least one adult member (≥18 years) and at least one adolescent member (11-17 years). * Participants willing to consume the majority of study foods provided * Participants willing to provide a total of two blood samples (maximum 25ml at each timepoint). Exclusion Criteria: * Any food allergies or intolerances, including anaphylaxis allergies * Individuals taking/unwilling to stop taking high dose vitamin D supplements (1000 IU) for a washout period (4 weeks before) and for the duration of the study period * Other major dietary exclusions, e.g. those following vegan or vegetarian lifestyles. * Individuals with conditions causing malabsorption, e.g. coeliac disease

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As listed by the trial registrant

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

Vitamin D biofortification Vitamin D fortification Vitamin D status

How to take part

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  1. The places running it

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  2. The official record

    The full official record for this study. This one lists no contact details, but it is the first place any would appear.

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  3. A doctor treating you

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Contacts and locations

Locations

  • Ulster University, Human Intervention Studies Unit, Coleraine, Co. Londonderry

    Coleraine, BT52 1SA, United Kingdom

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