3. Fluoride
Fluoride isn’t the important nutrient it’s been made out to be. This is especially true in how it negatively impacts the thyroid.
After 150 days of exposure to fluoride in large quantities, rats showed significantly reduced levels of TT3 and TT4 (6).
The study noted that: “fluoride can promote specific changes in the function and morphology of the thyroid.”
It’s important to note that toxicity stemmed from prolonged exposure rather then dosage.
Consider that most American cities have fluoridated tap water and that dental products also contain fluoride. It doesn’t take long for your thyroid to be affected.