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Prison vitamin d study: should inmates be tested?

NCT ID NCT02044133

Knowledge-focused Sponsor: Centre Hospitalier Departemental Vendee Source: ClinicalTrials.gov ↗

What the study statuses mean

This study's is highlighted.

Recruitment status, easiest to join first

Recruiting now
This trial is taking on new participants right now.
Not yet recruiting
Registered, but not yet taking participants.
By invitation only
Not open to general applications. Only people the study team invites can take part.
Paused
Paused for now. It may or may not start again.
Ongoing
Running, but no longer taking on new participants.
Completed This study
The trial has finished. Results may not be published yet.
Stopped early
Stopped early, before it reached the end. That can be for many reasons, including safety.
Cancelled
Cancelled before anyone took part.

Expanded access (not trials)

Expanded access
Not a trial. This treatment can be requested outside a study, case by case, for people who qualify.
Expanded access (paused)
Not a trial. The treatment can normally be requested outside a study, but is unavailable right now.
Expanded access (ended)
Not a trial. The treatment could once be requested outside a study, but no longer can.
Approved
The treatment has been approved, so it is available normally rather than through this programme.

When the status isn't known

Details not published
The full record has not been published yet, so there is little to show here.
Status unknown
This status has not been confirmed recently, so it may be out of date.

First seen Jun 26, 2026 · Last updated Jun 26, 2026

Summary

This study looked at whether measuring vitamin D levels in male prisoners at the start of their sentence and again after six months is worthwhile. Fifty-four men in a French prison took part, with some tested twice and others only at six months. The goal was to see if routine vitamin D testing could help detect deficiencies in this population.

What this could mean

Our plain-language read of the trial. This is informational only, not medical advice or a prediction.

Active substance
Vitamin D
What this could lead to
If successful, this could show that checking vitamin D levels in new prisoners helps identify deficiencies early.
What could go wrong
This is a small, early study with only 54 participants, so results may not apply to all prisons or populations.

This is an AI summary of the original study and may miss details. Read our disclaimer.

Study facts

What this study's own registry entry says, in plain language.

Phase

Not a phased trial

Phase numbers describe drug development. The registry uses this when they do not apply, as it does for trials of devices, procedures or behaviour changes, and for observational studies.

Participants

54 people

The number who actually took part.

Start date

Jan 2014

Finished

Jan 2016

Lead sponsor

Other sponsor

The registry's catch-all category, for sponsors it does not file as a company, a government agency, or a research network.

Who can take part

This study's own entry requirements. Only the study team can say for certain whether you qualify.

Ages

18 years and older

Sex

Male participants only

Healthy volunteers

Accepted

You do not need to have the condition being studied to take part.

Show the full entry requirements

Copied word for word from the study's registry entry, so the wording is the study team's rather than ours.

Inclusion Criteria: * Incarcerated person * Imprisoned in La Roche sur Yon * Male * Age \> 18 year old * Not opposed to participation in the study Exclusion Criteria: * Intellectual deficit not to understand the study * Taking osteoporosis treatment or any other affecting the metabolism of vitamin D * Renal failure, liver failure * Hypercalcemia * Thyroid dysfunction, parathyroid diseases * Duration of imprisonment less than the expected duration of the study. * Incarcerated person who had received supplementation of vitamin D in the 6 months prior

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As listed by the trial registrant

The condition terms exactly as the trial's registrant entered them.

Male prisoner

Contacts and locations

Locations

  • Centre hospitalier départemental Vendée

    La Roche-sur-Yon, 85925, France