My Sea Salt does not have iodine. I am using Morton Fine and they put a no iodine warning right on it. It is sea salt from Spain.
I think all sea salt has iodine in it. It’s in ocean water.
Almost all the sea salt I’ve looked into that I can find around here has additives, potassium iodide and anti-caking agents.
He’d be best off trying kosher salt for the time being. It is just salt.