Vitamin d in pregnancy fails to prevent asthma in kids
NCT ID NCT00920621
First seen Jun 24, 2026 · Last updated Jun 27, 2026 · Updated 2 times
Summary
This study tested whether giving pregnant women daily vitamin D supplements (4000 IU) could prevent asthma or recurrent wheezing in their children during the first three years of life. The trial enrolled 876 pregnant women with a personal or family history of asthma or allergies. Results showed no significant reduction in asthma or wheeze compared to a placebo.
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 worked, this could point toward a simple way to reduce childhood asthma risk by giving vitamin D to pregnant women.
What could go wrong
The trial was completed but did not show a clear benefit. The results are uncertain and may not apply to all populations.
Disclaimer
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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.
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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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.
Contacts and locations
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Locations
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George O'Connor, MD
Boston, Massachusetts, United States
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Leonard Bacharier, MD
St Louis, Missouri, United States
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Robert Zeiger, MD
San Diego, California, United States