Vitamin d doses tested as COVID-19 shield in chicago study
NCT ID NCT04868903
First seen Jun 27, 2026 · Last updated Jul 23, 2026 · Updated 2 times
Summary
This study looked at whether taking different amounts of vitamin D could lower the risk of getting COVID-19. About 1,475 adults from the Chicago area took either a low (400 IU), moderate (4,000 IU), or high (10,000 IU) daily dose of vitamin D for 9 months. Researchers tracked who got COVID-19 to see if higher doses offered more protection.
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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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Rush University Medical Center
Chicago, Illinois, 60612, United States
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University of Chicago
Chicago, Illinois, 60637-1622, United States
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