D2d Study


Study Type
Study Purpose
The purpose of this research study is to determine if daily vitamin D3 intake reduces the rate of progression from pre-diabetes to diabetes.
About the Study
The incidence of diabetes is increasing at an alarming rate both nationally and worldwide with 1.9 million new cases diagnosed in 2010 in the US alone. The purpose of this study is to see whether taking vitamin D can lower the risk of getting diabetes in people with a high risk for diabetes. As a food ingredient or dietary supplement, vitamin D is generally recognized as safe. However, we do not know if vitamin D is effective in preventing diabetes.
Study Design

Number of visits:

  • 1 Screening visit
  • 3 Clinic visits at the beginning of the study
  • Annual and Semi-annual outpatient visits until end of study

Study procedures:

  • Height, weight, vitals, physical exam
  • Waist measurement
  • Oral Glucose Tolerance Test (OGTT)
  • Pregnancy test
  • Blood draws and urine samples  
  • Questionnaires
All study procedures will be provided at no cost to participants.
Study Qualifications
  • Age:≥ 30 years old
  • Weight: BMI (≥ 24 [>22.5 for Asians] and ≤ 42) calculate your BMI
  • Pre-diabetic
Study Duration
Up to 4 years
Earn up to $150/year 1 and up to $75/year for years 2-4 for participation.
Study Contact
If you are interested in volunteering for the D2d study, click here to screen online, call 225-763-3000 or email clinicaltrials@pbrc.edu.

If you think you may be eligible, please click the button below to screen online.

Please do not fill out this questionnaire for anyone other than yourself unless you are their legal guardian.
If you know someone who may be interested please direct them to the site or have them call us directly at 225-763-3000.


English Calculation
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