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Low vs. Moderate to High Dose Vitamin D for Prevention of COVID-19

NCT04868903 · Status: COMPLETED · Phase: NA · Type: INTERVENTIONAL · Enrollment: 1475

Last updated 2026-02-20

Study results available
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Summary

The purpose of this study is to compare the risks of COVID-19 in individuals from Chicagoland communities randomized to low (400 IU/day) vs. moderate (4,000 IU/day) or high (10,000 IU/day) dose vitamin D.

Conditions

Interventions

DIETARY_SUPPLEMENT

Vitamin D3

Half the subjects will be randomized to the low dose vitamin D therapy (400 IU/day), which will serve as the control group, and half to moderate (4,000 IU/day) or high (10,000 IU/day). Study participants will have the option between being randomized to the low versus moderate or the low versus high dose arms.

Sponsors & Collaborators

  • Rush University Medical Center

    collaborator OTHER

  • University of Chicago

    lead OTHER

Study Design

Allocation
RANDOMIZED
Purpose
PREVENTION
Masking
QUADRUPLE
Model
PARALLEL

Eligibility

Min Age
18 Years
Sex
ALL
Healthy Volunteers
Yes

Timeline & Regulatory

Start
2020-11-30
Primary Completion
2024-12-01
Completion
2024-12-01

Countries

  • United States

Study Locations

More Related Trials

Entities

Diseases

Read the full study record

This page highlights key information. For complete eligibility criteria, study locations, investigator contacts, and the full protocol, visit the original record on ClinicalTrials.gov.

View NCT04868903 on ClinicalTrials.gov