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Clinical trialNCT02367599CompletedPhase 4Interventional

Effect of Vitamin D Supplementation on Bone Turnover Markers During PrEP in MSM

SponsorUniversity of California, San DiegoEnrollment48Patient Adherence
View the registry record on ClinicalTrials.gov

Summary

The lay summary the sponsor registered on ClinicalTrials.gov.

CCTG 595 is an open-label clinical trial of the effect of a text messaging intervention vs. standard of care on adherence to Truvada as PrEP in MSM at increased risk for HIV infection (ClinicalTrials.gov Identifier: NCT01761643). Eligible subjects for this matched case control substudy will receive vitamin D 4000 IU/day for 24 weeks, from week 24 through week 48. In CCTG 595, plasma from participants are being collected and stored at entry and every 12 weeks. These plasma samples will be used to measure P1NP, CTX, PTH, and vitamin D levels in both cases and controls at entry, week 24, and week 48.
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

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

United States
  • University Southern California

    Los Angeles, California, United States

  • University of California, San Diego

    San Diego, California, United States

  • Harbor-Ucla Medical Center

    Torrance, California, 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.

Vitamin D Supplement
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
15 Dec 2014
Primary completion
13 Jun 2018
Completion
11 Jul 2018
Last update posted
2 Jul 2020
Registered enrollment
48
Registry id
NCT02367599
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.