Clinical trialNCT01942694CompletedInterventional

Vitamin D and Type 2 Diabetes Study

SponsorTufts Medical CenterEnrollment2,423PrediabetesType 2 Diabetes

View the registry record on ClinicalTrials.gov

Summary

The lay summary the sponsor registered on ClinicalTrials.gov.

The goal of the Vitamin D and type 2 diabetes (D2d) study is to determine if vitamin D supplementation works to delay the onset of type 2 diabetes in people at risk for the disease and to gain a better understand how vitamin D affects glucose (sugar) metabolism.

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.

Anastassios Pittas, MD, MS
Tufts Medical Center
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

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

United States

Southwest American Indian Center
Phoenix, Arizona, United States
University of Southern California
Los Angeles, California, United States
Stanford University
Palo Alto, California, United States
University of Colorado, Denver
Aurora, Colorado, United States
Florida Hospital Translational Research Institute
Orlando, Florida, United States
Orlando Va Medical Center
Orlando, Florida, United States
Atlanta Va Medical Center
Decatur, Georgia, United States
Northwestern University
Chicago, Illinois, United States
University of Kansas Medical Center
Kansas City, Kansas, United States
Pennington Biomedical Research Center
Baton Rouge, Louisiana, United States
Tulane University Health Sciences
New Orleans, Louisiana, United States
Maine Medical Center
Scarborough, Maine, United States
Medstar Community Clinical Research Center
Hyattsville, Maryland, United States
Tufts Medical Center
Boston, Massachusetts, United States
Health Partners Riverside Clinic
Minneapolis, Minnesota, United States
Omaha Va Medical Center
Omaha, Nebraska, United States
University of Nebraska Medical Center
Omaha, Nebraska, United States
Beth Israel Medical Center
New York, New York, United States
Duke University
Durham, North Carolina, United States
Cleveland Clinic
Cleveland, Ohio, United States
Kaiser Permanente Center for Health Research
Portland, Oregon, United States
Medical University of South Carolina
Charleston, South Carolina, United States
University of Tennessee Health Science Center
Memphis, Tennessee, United States
University of Texas Southwestern Medical Center
Dallas, Texas, United States
Baylor College of Medicine
Houston, Texas, 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: 31 Oct 2013
Primary completion: 30 Nov 2018
Completion: 30 Nov 2018
Last update posted: 16 Aug 2022
Registered enrollment: 2,423
Registry id: NCT01942694

clinicaltrials.gov ↗

Source: ClinicalTrials.gov, via the CTTI AACT database, data as of 30 Jul 2026. Registry facts are shown as registered by the study sponsor; findmyKOL does not interpret them.