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Prenatal vitamin d may shield kids from asthma

NCT ID NCT00856947

Prevention Sponsor: Copenhagen Studies on Asthma in Childhood 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 This study
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 Results may not be published yet.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This status has not been confirmed recently, so it may be out of date.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 tests whether giving mothers high-dose vitamin D (2400 IU daily) from week 24 of pregnancy until one week after birth can prevent asthma symptoms like wheezing in their children. 600 mothers from the ABC cohort in Denmark are participating. The children are followed for several years to see if they develop persistent wheeze or asthma.

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 it works, this could point toward a simple way to reduce asthma risk in children by giving vitamin D to mothers during pregnancy.
What could go wrong
This is an early-phase study, so results are uncertain. The effect may be small or not appear at all, and the high dose might have unknown side effects.

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

Phase 1

The first testing in people. Mainly checks safety and dose, usually in a small group.

Participants

About 600 people

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

Start date

Mar 2009

Expected to finish

Jul 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

18 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: Mother: * Pregnant in week 22-26 of gestation * Participating in the ABC-cohort * Living in Sealand, Denmark * Fluent in Danish * Willing to let the child participate in the study Exclusion Criteria: Mother: * Intake of more than 400 IU of vitamin D during the last 6 months * Endocrinological disease such as calcium metabolic disorder, parathyroid disorder, thyroid disorder or Diabetes type 1 * Tuberculosis * Sarcoidosis * In need of diuretics or heart medication including calcium channel blockers

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Conditions

The condition(s) this trial relates to.

allergic disease Eczema Infections Respiratory Sounds asthma prevention target

As listed by the trial registrant

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

Asthma

Contacts and locations

Locations

  • Copenhagen University Hospital of Copenhagen

    Gentofte Municipality, Gentofte, 2820, Denmark

  • Næstved Hospital, Pediatric Department

    Næstved, Næstved, 4700, Denmark

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