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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.
Iodine is the 61st element in terms of abundance, making it not only one of the least abundant nonmetallic elements on Earth but also one of the rarest elements needed for life. Although iodine is not particularly abundant, it can be found in trace amounts nearly everywhere: water, soil, rocks, plants, animals and humans. Seawater is the largest reserve of iodine, holding about 34.5 million tons.