Does adding iodine help kids with mild thyroid problems?
Effects of iodine supplementation on thyroid function in children with mild congenital hypothyroidism and non-autoimmune subclinical hypothyroidism
Not medical advice. For informational purposes only. Always consult a healthcare professional. Terms
Surprising Findings
TSH increased significantly at 150 µg/day, but free T4 stayed flat—meaning the thyroid was working harder without producing more hormone.
Normally, rising TSH means the thyroid is trying to make more hormone—so if T4 didn’t rise, it suggests the gland is stuck, not improving.
Practical Takeaways
Don’t give your child iodine supplements for mild thyroid issues unless a doctor confirms iodine deficiency via urine test.
Not medical advice. For informational purposes only. Always consult a healthcare professional. Terms
Surprising Findings
TSH increased significantly at 150 µg/day, but free T4 stayed flat—meaning the thyroid was working harder without producing more hormone.
Normally, rising TSH means the thyroid is trying to make more hormone—so if T4 didn’t rise, it suggests the gland is stuck, not improving.
Practical Takeaways
Don’t give your child iodine supplements for mild thyroid issues unless a doctor confirms iodine deficiency via urine test.
Publication
Journal
Journal of Endocrinological Investigation
Year
2025
Authors
C. Di Cosmo, Luisa Pignata, Brunella Bagattini, P. Agretti, Giuseppina de Marco, E. Ferrarini, Ferruccio Santini, L. Montanelli, M. Tonacchera
Related Content
Claims (6)
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.
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.
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.
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.
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.