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Clinical trialNCT04573946Active, not recruitingInterventional

VITamin D and OmegA-3 TriaL: Interrelationship of Vitamin D and Vitamin K on Bone (VITAL)

SponsorBrigham and Women's HospitalEnrollment25,871Bone DensityBone HealthFractures
View the registry record on ClinicalTrials.gov

Summary

The lay summary the sponsor registered on ClinicalTrials.gov.

Vitamin D supplements are widely promoted for bone health. Both vitamin D and vitamin K are important for deposition of calcium in bone, but little is known about the relationship of vitamin K status and bone health.
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.

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

The drug and biological interventions registered on this study, normalized to their RxNorm ingredient where possible.

Omega-3 fatty acids
Linked drugs open the directory filtered to KOLs working with them.clinicaltrials.gov ↗

Registration & key dates

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

Start
1 Jul 2019
Primary completion
21 Jul 2023
Completion
31 Dec 2026
Last update posted
27 Apr 2026
Registered enrollment
25,871
Registry id
NCT04573946
clinicaltrials.gov ↗

Source: ClinicalTrials.gov, via the CTTI AACT database, data as of 24 Aug 2026. Registry facts are shown as registered by the study sponsor; findmyKOL does not interpret them.