It's definitely in seafood. Dairy and eggs depend on what the cows and chickens have been fed. In regions with low soil iodine content, you can expect the egg

It's definitely in seafood. Dairy and eggs depend on what the cows and chickens have been fed. In regions with low soil iodine content, you can expect the eggs and milk to also be low in iodine. Vegetables and grains also have a significant amount of iodine in that sort of soil (it's where the cows and chickens get it).