Vitamin d doses tested as COVID-19 shield in chicago study
NCT ID NCT04868903
First seen Jun 27, 2026 · Last updated Jun 27, 2026
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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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.
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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