Iodine study: should all pregnant women get supplements or only those who need them?

NCT ID NCT03078140

Completed Prevention Sponsor: Chiang Mai University Source: ClinicalTrials.gov ↗

First seen Jun 25, 2026 · Last updated Jun 27, 2026 · Updated 1 time

Summary

This study looked at two approaches to giving iodine supplements to pregnant women. One group received a daily iodine pill from 14 weeks until delivery. The other group had their urine iodine tested first; only those with low levels got iodine, while others got an iron pill. The goal was to see if the selective approach worked as well as routine supplementation. The study involved 208 women in Thailand.

What this could mean

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

Active substance: iodine supplement (Triferdine) and iron supplement (Ferli-6)
What this could lead to: If successful, this could show that checking iodine levels first and supplementing only when needed is as effective as giving iodine to everyone, potentially reducing unnecessary supplementation.
What could go wrong: This is a small, completed study focused on urine iodine levels, not on health outcomes for mothers or babies. Results may not apply to other populations or settings.

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Conditions

The condition(s) this trial relates to.

endemic goiter pregnancy disorder

As listed by the trial registrant

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

IODINE DEFICIENCY PREGNANCY RELATED

Contacts and locations

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Locations

Kuntharee Traisrisilp

Chiang Mai, 50200, Thailand

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