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Bread boost: fortified loaf may ward off winter vitamin d deficiency

NCT ID NCT07481240

Prevention Sponsor: University College Cork Source: ClinicalTrials.gov ↗

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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
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 Results may not be published yet.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)
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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
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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This status has not been confirmed recently, so it may be out of date.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 tested whether eating vitamin D fortified bread can prevent low vitamin D levels in Irish families during winter. 128 people from different households took part. Researchers compared vitamin D levels between those who ate the fortified bread and those who ate regular bread over 8 weeks.

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

128 people

The number who actually took part.

Started

Nov 2025

Finished

Apr 2026

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

5 to 59 years

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: 1. Provide written informed consent if over 16 years; informed parental consent for children under-16 years, plus age-appropriate assent for children under-16 years. 2. Be a household with at least one adult ≥18 years, with at least one dependent aged 5 years or older. 3. Willing to consume bread provided and have storage capacity for frozen bread. 4. Be in good general health. 5. Be willing to follow the assigned diet for 8 weeks and attend the required appointments. Exclusion Criteria: 1. Daily consumption of a vitamin D supplement with a dose exceeding \>10µg/d (400 IU) equivalent. 2. Exposure to factors that may influence vitamin D status, such as winter sun holiday, ski holiday, tanning beds etc. 3. Are following a medically prescribed diet. 4. Have a diagnosis of a medical condition that may interfere with vitamin D absorption, such as Coeliac disease, Inflammatory Bowel Disease, cystic fibrosis, or metabolism, such as liver disease, renal disease. 5. Have a history of active cancer or a diagnosis of cancer within the past 5 years. 6. Have an allergy to the bread ingredients. 7. Are participating in another research study with an intervention or other lifestyle programme that would interfere with the outcomes of the study. 8. Are unable to read, write, or understand English.

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Conditions

The condition(s) this trial relates to.

vitamin D deficiency prevention target

As listed by the trial registrant

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

Vitamin D deficiency

Contacts and locations

Locations

  • Human Nutrition Studies Unit, School of Food and Nutritional Sciences

    Cork, Co. Cork, T12 K8AF, Ireland

  • UCD Institute of Food and Health

    Dublin, Ireland

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