In children with a mild form of underactive thyroid and an intact thyroid gland, taking iodine supplements for a year does not cause the thyroid to grow larger or change shape, based on ultrasound measurements.

31

Pro

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Against

Evidence from Studies

Supporting (1)

31

Community contributions welcome

31

Effects of iodine supplementation on thyroid function in children with mild congenital hypothyroidism and non-autoimmune subclinical hypothyroidism

Randomized Controlled Trial

Human

2026 Feb

The study gave kids with a mild thyroid condition a small amount of iodine for a year and found their thyroid didn’t get bigger or change shape, even though their thyroid hormone levels shifted a little. So, iodine didn’t hurt their thyroid.

Contradicting (0)

0

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No contradicting evidence found

Gold Standard Evidence Needed

According to GRADE and EBM methodology, here is what ideal scientific evidence would look like to definitively prove or disprove this specific claim, ordered from strongest to weakest evidence.

Source Study

Effects of iodine supplementation on thyroid function in children with mild congenital hypothyroidism and non-autoimmune subclinical hypothyroidism

Score: 31

DOI: 10.1007/s40618-025-02718-x

Similar Assertions

In children with a mild form of congenital hypothyroidism and an intact thyroid gland, giving iodine supplements does not change how their thyroid function develops over time, based on measurements taken after stopping iodine and during one year of monitoring.

31

0

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In children with mild thyroid hormone imbalances, taking iodine supplements that gradually increase from 50 to 150 micrograms per day for nine months leads to a measurable increase in TSH hormone levels, but does not change other thyroid markers or cause clinical harm.

31

0

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In children with a specific genetic mutation (DUOX2) and mild thyroid underactivity not caused by autoimmunity, taking iodine supplements within the range of 50–150 micrograms per day does not bring thyroid hormone levels back to normal, because thyroid-stimulating hormone (TSH) stays high.

31

0

84%

Giving children with mild thyroid hormone imbalance a daily iodine supplement within the recommended range for up to one year does not lead to the development of new antibodies targeting the thyroid gland.

31

0

82%

Not getting enough iodine when kids are growing can hurt their brain development for good, because iodine is needed to make important brain hormones.

0

77%