The Claim
At moderate urinary iodine levels (≤300 μg/L), higher fluoride exposure is associated with lower serum total triiodothyronine (TT3) levels in school-age children, indicating a potential disruption in thyroid hormone production under specific iodine conditions.
What the research says
Supports is higher
Support is ahead, but a single strong opposing study can change this.
These are independent scores, not a percentage. Higher-grade studies count more, so a single strong opposing study can outweigh several weaker ones.
When kids have just enough iodine in their urine but are exposed to more fluoride, their bodies might make less of an important thyroid hormone called TT3 — like their thyroid is struggling a bit under those conditions.
See the scientific wording
At moderate urinary iodine levels (≤300 μg/L), higher fluoride exposure is associated with lower serum total triiodothyronine (TT3) levels in school-age children, indicating a potential disruption in thyroid hormone production under specific iodine conditions.
What the research says
1 studyThis study found that when kids have a normal amount of iodine in their urine, too much fluoride makes their thyroid produce less of an important hormone called TT3. So yes, fluoride can mess with thyroid function—but only when iodine isn’t too high or too low.
Score breakdown, mechanism chain, raw evidence, ideal studies needed & 1 supporting studies
Not medical advice. For informational purposes only. Always consult a qualified healthcare professional before making health decisions.