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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 a chemical element with symbol I and atomic number 53. The name is from Greek á¼°Î¿ÎµÎ¹Î´Î®Ï ioeidÄs, meaning violet or purple, due to the color of elemental iodine vapor.Iodine and its compounds are primarily used in nutrition, and industrially in the production of acetic acid and certain polymers. Tincture of iodine: iodine in ethanol, or iodine and sodium iodide in a mixture of ethanol and water. 2  Lugol's iodine: iodine and iodide in water alone, forming mostly triiodide. 3  Unlike tincture of iodine, Lugol's has a minimized amount of the free iodine (I 2) component.