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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.
Nori will even absorb water from the air when stored, and should be stored tightly with a desiccant if not used soon after purchasing. Nutritionally, Nori is high in protein, minerals, vitamins and fiber. One sheet of Nori, which can be used for an entire roll of sushi, will add only 13 calories to the roll. This is thankful as Nori is an essential ingredient in sushi as we know it today. About a third of Nori is protein and a third fiber, making it one of the main reasons sushi is such a healthy meal.