The Study
Exploring the Impacts of Fluoride-Induced Thyroid Toxicity: A Comprehensive Review
This study is like a report that reads lots of other science stories and says, 'Many of them show that too much fluoride might mess with the thyroid.' But it didn’t do any experiments itself, so we can’t say for sure that fluoride causes the problem — just that some studies think it might.
Analysis score
Maximum 5 for a narrative review.
Where the score came from
Fluoride in water can block iodine from reaching the thyroid, which makes it hard for the body to make important hormones that help your brain and body work right.
Where does this study sit?
Reviews of RCTs (Meta-analyses)
Max 100Randomized Trials
Max 90Reviews of Cohort Studies
Max 85Cohort Studies
Max 72Reviews of Case-Control Studies
Max 63Case-Control Studies
Max 58Cross-Sectional & Case Series
Max 50Expert Opinion
Max 51 / 100
Quality score
Based on clinical experience or non-systematic literature reviews. The lowest level of evidence as they are most susceptible to bias and personal perspective.
Key takeaways
Summary
Based on the study abstract and findings.
- 1Yes — if you live in an area with very high fluoride in water, your thyroid might not work well, and kids could have lower brain development.
- 2Fluoride lowers T3 and T4 hormones, raises TSH, and damages thyroid cells; may lower IQ in kids if mom drank high-fluoride water while pregnant.
Score breakdown, methodology, conflicts of interest, evidence analysis & raw study data
Publication
Journal
Biological Trace Element Research
Year
2025
Authors
Bhavna Patial, Ruhi Thakur
Related Content
Claims (6)
Fluoride might stop your thyroid from absorbing enough iodine, which it needs to make hormones—this could make an iodine shortage worse and mess up your metabolism.
People who drink water with a lot of fluoride for a long time may have lower levels of certain thyroid hormones and higher levels of a hormone that tells the thyroid to work harder—this could mean their thyroid isn’t working quite right.
Too much fluoride might mess up the thyroid’s ability to handle harmful chemicals in the body, which could hurt the cells that make thyroid hormones and make the gland work less well.
If a baby is exposed to fluoride while still in the womb or as a young child, it might affect how their brain grows and works, possibly by messing with their thyroid hormones, which could lead to lower IQ, changes in brain shape, or hearing problems.
Drinking tea might make it harder for your body to use iodine, which is important for your thyroid to work properly.
Your thyroid gland might soak up more fluoride than other parts of your body, which could make it more likely to get harmed by it.
Not medical advice. For informational purposes only. Always consult a qualified healthcare professional before making health decisions.