Can vitamin d stop COVID? chicago study tests high doses
NCT ID NCT04868903
First seen Jan 07, 2026 · Last updated May 16, 2026 · Updated 19 times
Summary
This study looked at whether taking moderate (4,000 IU) or high (10,000 IU) doses of vitamin D daily could lower the risk of getting COVID-19 compared to a low dose (400 IU). About 1,475 adults from the Chicago area took part for 9 months. Researchers tracked who got a confirmed COVID-19 infection 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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Contacts and locations
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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
Conditions
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