You would be unlikely to be sensitive to the amount of iodine in, say, iodized salt.
It is a trace element, with the RDA measured in microgrammes per day.
For anyone living in the goitre belt, the minimal expense of buying the medicated salt might be well worth paying.
A few dollars a year.
Certainly wouldn't do any harm.
Excess Iodine is well tolerated, and simply excreted.
If you buy iodized salt, buy it in small amounts and keep it well sealed.
The iodide will break down into iodine, which will sublimate if left open, reducing the iodine content to zero.