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Vitamin d showdown: which pill works best?

NCT ID NCT07317830

Disease control Sponsor: Center for Health Sciences, Serbia Source: ClinicalTrials.gov ↗

What the study statuses mean

This study's is highlighted.

Recruitment status, easiest to join first

Recruiting now This study
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
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 Results may not be published yet.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This status has not been confirmed recently, so it may be out of date.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 27, 2026 · Last updated Jun 27, 2026

Summary

This study compares two different vitamin D3 supplements to see which one raises vitamin D levels faster and more effectively in adults who are low in vitamin D. About 20 people will take one of the two supplements daily for eight weeks. The goal is to find the best way to correct vitamin D deficiency.

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

About 20 people

The number the study aims to enrol. It can still change while the study runs.

Expected to start

Dec 2025

An estimate. Start dates often move.

Expected to finish

Jun 2026

An estimate. End dates often move.

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 to 80 years

Sex

Anyone

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: * Adults aged 18 years and over * Serum 25(OH)D \< 75 nmol/L * BMI 18.5 - 29.9 kg/m2 * Free of clinically significant acute disorders and severe chronic diseases * No planned travel to high-UV destinations or tanning bed use during the trial * Willing to avoid non-study vitamin D supplements * Able to give written informed consent and comply with study visits * Submitted informed consent Exclusion Criteria: * Pregnancy of breast feeding * Underweight or obesity * History of any dietary supplement use within 8 weeks before screening * Medications that materially alter vitamin D metabolism or calcium balance * Subjects with a history of medicine or alcohol abuse * Abnormal values for lab clinical chemistry (\> 2 SD) * Unwillingness to return for follow-up analysis * Participation in other clinical trials within 60 days prior to screening

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Conditions

The condition(s) this trial relates to.

vitamin D deficiency

As listed by the trial registrant

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

Vitamin D deficiency

How to take part

Only the study team decides who joins. These are the ways to reach them.

  1. The places running it

    1 site. The list below names each one and where it is.

  2. The official record

    ClinicalTrials.gov lists the study team's own contact details, including names and phone numbers. We don't republish those.

    Open the record ↗

  3. A doctor treating you

    A doctor who knows your case can contact a study site on your behalf, and can tell you whether this study is worth pursuing at all.

Contacts and locations

Locations

  • Center for Health Sciences

    RECRUITING

    Belgrade, 11000, Serbia

More trials for these conditions

Other studies related to the condition(s) this trial covers.