Vitamin d duel: does a higher dose ward off COVID?
NCT ID NCT07128069
First seen Jun 27, 2026 · Last updated Aug 07, 2026 · Updated 1 time
Summary
This study looked at whether taking a moderate dose (4,000 IU) of vitamin D daily could lower the chance of getting COVID-19 compared to a low dose (400 IU). Over 2,000 adults in the US took part for 12 months. The goal was to see if vitamin D can help prevent COVID-19 infection.
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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
Locations
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University of Chicago
Chicago, Illinois, 60637, United States
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