Seaweed (such as kelp, nori, kombu, and wakame) is one of the best food sources of iodine, but it is highly variable in its content Other good sources include seafood, dairy products (partly due to the use of iodine feed supplements and iodophor sanitizing agents in the dairy industry ), grain products, and eggs. Dairy products, especially milk, and grain products are the major contributors of iodine to the American diet.

NIH National Institutes of Health