Vitamin D/Calcium Polyp Prevention Study

ClinicalTrials.gov ID: NCT00153816

Public ClinicalTrials.gov record NCT00153816. Field values are reproduced from the official study page; the official ClinicalTrials.gov record remains the source of truth for eligibility, enrollment, and contact information.

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ClinicalTrials.gov public records Last synced Jul 22, 2026, 5:50 AM EDT

Data is sourced from official ClinicalTrials.gov public API records. Always review the official ClinicalTrials.gov record for the latest information.

Study identification

NCT ID: NCT00153816
Recruitment status: Completed
Study type: Interventional
Phase: Phase 2, Phase 3
Lead sponsor: Dartmouth-Hitchcock Medical Center; Other
Enrollment: 2,813 participants

Conditions and interventions

Conditions

Interventions

Calcium Carbonate Drug
Vitamin D3 Drug
placebo Drug

Drug

Eligibility (public fields only)

Age range: 45 Years to 75 Years
Sex: All
Healthy volunteers: Healthy volunteers not accepted

This page does not interpret eligibility. Detailed inclusion and exclusion criteria are on the official ClinicalTrials.gov record.

Study timeline

Start date: Jun 30, 2004
Primary completion: Sep 30, 2013
Completion: May 31, 2016
Last update posted: Mar 14, 2017

2004 – 2016

United States locations

U.S. sites: 10
U.S. states: 10
U.S. cities: 10

Facility	City	State	ZIP	Site status
University of Southern California	Los Angeles	California	90089	—
University of Colorado	Denver	Colorado	80220	—
Emory University	Atlanta	Georgia	30322	—
University of Iowa	Iowa City	Iowa	52242	—
University of Minnesota	Minneapolis	Minnesota	55455	—
Dartmouth Hitchcock Medical Center	Lebanon	New Hampshire	03766	—
University of North Carolina	Chapel Hill	North Carolina	27599	—
Cleveland Clinic Foundation	Cleveland	Ohio	44195	—
University of South Carolina	Columbia	South Carolina	29203	—
University of Texas	Houston	Texas	77030	—

Site contact phone numbers, emails, and investigator names are intentionally not displayed here. Open the official ClinicalTrials.gov record for site contact information.

Non-U.S. locations

This page focuses on the U.S. directory. The official record also lists 1 non-U.S. site.

About this trial record page

What this page shows: Public field values for ClinicalTrials.gov record NCT00153816, including study identification, conditions, interventions, eligibility (age, sex, healthy volunteer), timeline, and U.S. site list.
What this page does not do: No medical advice, eligibility judgments, treatment recommendations, study quality scoring, or AI-generated medical summaries. No site contact phone numbers, emails, or investigator names.
Where the data comes from: Sourced from the official ClinicalTrials.gov public API. The official record is the source of truth.
Last refresh: Last update posted Mar 14, 2017 · Synced Jul 22, 2026

Open the official record

The complete protocol, eligibility criteria, and contact information for NCT00153816 live on ClinicalTrials.gov.

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