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Most forms of kelp have 500-1500 ppm (parts per million) of iodine; nori has 15 ppm. Toasting doesn't affect seaweed's iodine content, so eat it in whatever form you like best, but don't depend only on nori to boost your iodine levels.
Seaweed has such a large proportion of iodine compared to dietary minimum requirements, that it is primarily known as a source of this nutrient. The highest iodine content is found in brown algae, with dry kelp ranging from 1500-8000 ppm (parts per million) and dry rockweed (Fucus) from 500-1000 ppm.ust one gram of dried brown algae provides from 500-8,000 g of iodine and even the green and red algae (such as the purple nori that is used in Japanese cuisine) provides 100-300 g in a single gram. The amounts of seaweed ingested as food in Japan, or in supplements, is often considerably more than 1 gram a day.