Michael V said:

roughbarked said:

Michael V said:

Some have been: google results:

Our agricultural soils cannot provide the Iodine requirement.

That depends.

I knew a dairy farmer out of Armidale that over winter often had whole batches “rejected” at the milk factory because the milk had too much iodine. Interestingly, while he was not paid for those batches, they kept it anyway and diluted it with low-iodine milk produced elsewhere in the region.

He had high iodine soils, and the low water content of the frost-browned grasses over winter caused a spike in the iodine content.

Interesting.