I think kelp would be good also. My father takes it and has no other source of iodine and does well. My country is very low on iodine and in fact, thyroid problems are on the increase. When i gave up iodised salt, i got very very ill and didn't know why. i was eating healthy rock salt, but it lacked the iodine i needed for health.

So i deteriorated badly. that's how crucial iodine is for normal functioning.

i would just make sure the kelp has been tested for impurities and heavy metals.