Clinical trialNCT04536298CompletedPhase 3Interventional

Vitamin D for COVID-19 Trial

SponsorBrigham and Women's HospitalEnrollment2,024COVID-19

View the registry record on ClinicalTrials.gov

Summary

The lay summary the sponsor registered on ClinicalTrials.gov.

The Vitamin D for COVID-19 Trial (VIVID) is a randomized, placebo-controlled clinical trial in 2024 men and women from across the U.S. and Mongolia to investigate whether taking a daily dietary supplement of vitamin D vs. placebo for 4 weeks reduces the rate of seeking healthcare for symptoms or concerns related to COVID-19 in participants recently diagnosed with COVID-19, and reduces the risk of infection with severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) in household contacts of individuals with newly diagnosed COVID-19.

clinicaltrials.gov ↗

Investigators

The overall officials registered on this study. Names that resolve to a FindMyKOL profile link to it; the rest are shown as registered.

Davaasambuu Ganmaa, PhD
Harvard School of Public Health (HSPH)
Principal Investigator
clinicaltrials.gov ↗
JoAnn E Manson, MD, DrPH
Brigham and Women's Hospital
Principal Investigator
clinicaltrials.gov ↗
Rui Wang, PhD
Harvard Medical School (HMS and HSDM)
Principal Investigator
clinicaltrials.gov ↗

A profile link is shown only when the registered name resolves to a person record with a confident, namesake-checked match; ambiguous names stay unlinked.

Sites

1 registered facility, with the per-site recruitment status where the registry publishes one. ClinicalTrials.gov does not publish per-site enrollment counts.

United States

Brigham and Women'S Hospital
Boston, Massachusetts, United States

Site investigator names are published by ClinicalTrials.gov only while a study recruits, so completed studies list sites without them.

Drugs studied

No drug or biological interventions are in our data for this study. It may test a procedure, device or behavioral intervention, or the intervention list isn't in our current snapshot. See the registry record ↗. Why? →

Registration & key dates

Registry attributes as recorded on the ClinicalTrials.gov study record.

Start: 28 Dec 2020
Primary completion: 1 Jul 2024
Completion: 1 Jul 2024
Last update posted: 24 Sept 2025
Registered enrollment: 2,024
Registry id: NCT04536298

clinicaltrials.gov ↗

Source: ClinicalTrials.gov, via the CTTI AACT database, data as of 4 Nov 2026. Registry facts are shown as registered by the study sponsor; FindMyKOL does not interpret them.