Fluoride leads to the lowering of serum iodine levels, and higher iodine excretion rates. (The basis for the fluoride treatment in cases of iodine-induced hyperthyroidism). This can be seen in urinary iodine (UIC) levels. Serum fluoride levels correlate with UIC levels.
Here is another graph by Shashi and Singla (2013).
Comments on current issues in fluoride/thyroid research.
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