Drinking tea might make it harder for your body to use iodine, which is important for your thyroid to work properly.

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Evidence from Studies

Supporting (1)

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Exploring the Impacts of Fluoride-Induced Thyroid Toxicity: A Comprehensive Review

Narrative Review

Human

2025 Oct 11

The study says fluoride — no matter where it comes from, like water or tea — can block the thyroid from using iodine, which is needed to make hormones. So even though it didn’t study tea specifically, it still supports the idea that fluoride in tea could do the same thing.

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Similar Assertions

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.

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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.

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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.

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