Pregnant women needed: could extra vitamin d stop asthma before it starts?
NCT ID NCT06570889
First seen Nov 01, 2025 · Last updated Jun 23, 2026 · Updated 33 times
Summary
This study is testing whether taking a higher dose of vitamin D (2400 IU daily) during pregnancy can prevent asthma and persistent wheezing in children up to age 3. Researchers plan to enroll 2000 pregnant women in Denmark. Participants take either vitamin D or a placebo capsule from week 22-26 of pregnancy until one week after giving birth.
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the original study
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Summaries may miss details or leave out important information. Before applying or accepting participation, make sure you have read and understood the full study. Curemydisease.com takes no responsibility whatsoever for anything missed, misunderstood, or acted upon as a result of our summary — we know it does not capture everything.
This is a summary of the original study . Summaries may miss details or leave out important information. Before applying or accepting participation, make sure you have read and understood the full study. Curemydisease.com takes no responsibility whatsoever for anything missed, misunderstood, or acted upon as a result of our summary — we know it does not capture everything.
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Contacts and locations
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Study contacts
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Contact
Phone: •••-•••-•••• Email: •••••@•••••
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Contact
Phone: •••-•••-•••• Email: •••••@•••••
Locations
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Copenhagen University Hospital of Copenhagen
RECRUITINGGentofte Municipality, DK-2820, Denmark
Contact
Contact Phone: •••-•••-•••• Email: •••••@•••••
Contact
Contact Phone: •••-•••-•••• Email: •••••@•••••
What this could mean
Our plain-language read of the trial. This is informational only — not medical advice or a prediction.
Active substance
Vitamin D (cholecalciferol D3)
What this could lead to
If it works, this could point toward a simple, low-cost way to reduce the risk of asthma in young children by giving higher doses of vitamin D during pregnancy.
What could go wrong
This is a large phase 3 trial, but it is still possible that the supplement will not reduce asthma risk. The study only includes pregnant women with specific fatty acid levels, so results may not apply to everyone.
Conditions
The condition(s) this trial relates to.
As listed by the trial registrant
The condition terms exactly as the trial's registrant entered them.