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Personalized Vitamin D Supplementation in European and African Americans

NCT02362269 · Status: COMPLETED · Phase: NA · Type: INTERVENTIONAL · Enrollment: 169

Last updated 2020-12-01

Study results available
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Summary

The proposed study is a randomized, double-blind, controlled, multi-center clinical trial of six months of daily oral vitamin D3 (cholecalciferol). This study will randomize 334 community-dwelling post-menopausal women of European and African descent (\~167 from each ancestry) in a 1:1 ratio between the control arm and the dosing algorithm arm using stratified block randomization with a block size of six and stratification by site (ancestry). The sample size of 334 includes 10% over-recruitment to allow for loss to follow-up. The European ancestry women will be seen in the Madison clinic and the African ancestry women will be seen in the Milwaukee clinic. The proposed study will focus on post-menopausal women because this is the subset of the population that both Dr. Engelman's and Dr. Binkley's preliminary data are drawn from. Moreover, 25(OH)D concentrations are typically lower in women and in older individuals, since production of vitamin D in the skin following sun exposure decreases with age. Therefore, this group of individuals is likely to benefit the most from vitamin D supplementation, especially when personalized based on biology using the proposed dosing algorithm.

Conditions

  • Vitamin D Deficiency

Interventions

DIETARY_SUPPLEMENT

Vitamin D

Gelcaps containing 1000, 2500, and 4000 IU of vitamin D3 will be obtained from Tischon corporation (Westbury, NY). The gelcaps will be protected from light and not stored above 25° C. Participants will be instructed to take their vitamin D3 gelcaps with supper daily. Compliance with study supplementation will be documented by pill count at the time of each study visits.

Sponsors & Collaborators

  • Medical College of Wisconsin

    collaborator OTHER

  • University of Wisconsin, Madison

    lead OTHER

Principal Investigators

  • Corinne Engelman, PhD · University of Wisconsin, Madison

Study Design

Allocation
RANDOMIZED
Purpose
TREATMENT
Masking
DOUBLE
Model
PARALLEL

Eligibility

Sex
FEMALE
Healthy Volunteers
Yes

Timeline & Regulatory

Start
2015-10-30
Primary Completion
2019-05-03
Completion
2019-05-03

Countries

  • United States

Study Locations

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Read the full study record

This page highlights key information. For complete eligibility criteria, study locations, investigator contacts, and the full protocol, visit the original record on ClinicalTrials.gov.

View NCT02362269 on ClinicalTrials.gov