Kelp, the wonder gift of the sea. A serving of 1/2 teaspoon provides approximately 6 milligrams of iodine, or 40 times the RDA. Is that safe? It is widely used in Japan and shows no ill effects with markedly longer lifespan. It is advisable to consult your health practitioner before making the shift.
I'm in my fifties and was bought up in New Zealand using Kelp salt. We never had 'table salt' in the house. It is a required taste when you first use it, i'm told, and I feel good that I'm using it. We are what we think as well as eat. :-)