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Breastfeeding Moms' iodine needs under the microscope

NCT ID NCT05382793

Knowledge-focused Sponsor: University Children's Hospital, Zurich 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 Results may not be published yet.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This status has not been confirmed recently, so it may be out of date.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 how much iodine breastfeeding mothers need each day. Seventeen healthy mother-infant pairs took different doses of iodine supplements for five days. Researchers measured iodine levels in urine, blood, and breast milk to figure out the right daily amount for both mom and baby.

What this could mean

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

Active substance
iodine (potassium iodide) as a dietary supplement
What this could lead to
If successful, this could help set clear iodine intake guidelines for breastfeeding women, ensuring babies get enough iodine for healthy development.
What could go wrong
This is a small, completed study with only 17 participants, so results may not apply to all women. It focuses on measuring needs, not testing a new treatment.

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

17 people

The number who actually took part.

Started

May 2022

Finished

Dec 2023

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 49 years

Sex

Female 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.

Mother-infant pairs in good health, free of any acute illness or chronic thyroid disease. Mothers Inclusion criteria: 1. Consent to enroll herself and her baby; 2. Age 18 to 49 years; 3. Singleton pregnancy; 4. Exclusively breastfeeding; 5. Self-estimated BMI \<30 kg/m2 before conception. Exclusion criteria: 1. TSH \>6 mIU/L; 2. Anemia (Hb \<11.7 g/L); 3. Pregnancy (self-reported); 4. Acute illness (e.g. gastroenteritis); 5. History of thyroid disease, diabetes, metabolic disease or inflammatory bowel disease (self-reported); 6. Currently smoking (\>1 cigarette/day); 7. Drug abuse or extensive alcohol intake; 8. Exposure to iodine-containing X-ray or computed tomography contrast agents during the past 6 months; 9. Adenomatous goiter, dermatitis, anti-C1q-vasculitis. Infants Inclusion criteria: 1. Full term (38-42 weeks); 2. Birthweight ≥2.5 kg; 3. Exclusively breastfed; 4. Age 0-10 weeks at recruitment. Exclusion criteria: 1. Age \>6 months; 2. TSH \>10 mIU/L at neonatal screening at 2-5 days after birth (i.e. infants not requested to attend recall assessment); 3. Diagnosed or suspected colic.

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Conditions

The condition(s) this trial relates to.

endemic goiter

As listed by the trial registrant

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

Healthy Iodine deficiency

Contacts and locations

Locations

  • Nutrition Research Unit, University Children's Hospital Zurich

    Zurich, 8032, Switzerland

More trials for these conditions

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