If you live in the inland area, you need to get iodine from something like Kombu seaweeed. Even people live in the coast area like HK, most them lack “iodine”. Please take a look this article.

http://english.sina.com/life/2011/0713/380921.html

I found the blog that treated our product “Japanese Delight” Vegetarian Garlic Soy Sauce. Please take a look!

http://www.thenervouscook.com/2011/07/see-weeds-seaweed.html