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Vitamin d secrets in pregnancy: new study tracks how women use it

NCT ID NCT02705287

Knowledge-focused Sponsor: Cornell University 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 Results may not be published yet.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This status has not been confirmed recently, so it may be out of date.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 is tracking how pregnant and non-pregnant women absorb and use vitamin D, especially in relation to obesity and genetic background. Researchers will give 160 women a tiny, safe dose of labeled vitamin D and take blood samples over 40 days. The goal is to learn how pregnancy changes vitamin D dynamics, not to test a treatment.

What this could mean

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

Active substance
deuterated vitamin D3 (tracer dose)
What this could lead to
If successful, this could help doctors better understand how pregnancy, weight, and genetics affect vitamin D needs, leading to improved nutrition guidelines.
What could go wrong
This is an observational study with a small dose of labeled vitamin D, not a treatment trial. It will not directly improve health or cure any condition.

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.

Participants

About 160 people

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

Started

Oct 2024

Expected to finish

May 2029

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.

Who is studied

Pregnant women and non-pregnant women of reproductive age

Ages

20 to 39 years

Sex

Female participants only

Healthy volunteers

Not accepted

This study is not open to healthy volunteers. The entry requirements below say who it is open to.

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 (Non-pregnant and pregnant participants participants): * Self-reported White and Black women * Age 20-39 * Body mass index (BMI) 1or pre-pregnancy BMI (If currently pregnant) either 18.5-24.9 kg/m2 or greater than or equal to 30 kg/m2 Inclusion Criteria (Additional criteria for pregnant participants): * Singleton pregnancy * Recruited in first trimester, second trimester, or third trimester * No pregnancy complications Exclusion Criteria (Non-pregnant and pregnant participants): * BMI or pre-pregnancy BMI \<18.5 kg/m2 * Human immunodeficiency virus (HIV) infection * Diagnosed eating disorder * Malabsorption disease * Diabetes * Elevated diastolic blood pressure (\>110 mm/Hg) * Steroid use * Substance abuse history * Current use of medications known to influence vitamin D or calcium homeostasis * Plans to travel to lower latitude during the 20-day study period * Plans to become pregnant during the study period (non-pregnant only) * Refuses to discontinue tanning bed use during study period * Refuses to discontinue vitamin or mineral supplement use during study period (non-pregnant only) Exclusion Criteria (Additional criteria for pregnant participants): * Gestational diabetes * Pregnancy hypertension

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As listed by the trial registrant

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

Pregnancy

How to take part

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  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

  • University of Rochester, 518 Hylan Building

    RECRUITING

    Rochester, New York, 14627, United States

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