Iron Supplement! By putting an iron egg in boiling water, iron dissolves and you can supplement your iron intake. Use it when making tea, coffee, miso soup, simmered dishes, ramen, etc. Boil it in a kettle or pot for about 5 minutes after it comes to a boil to get more iron. After use, scrub and wash with a sponge. Shake off the water and wrap it in kitchen paper to prevent rust♪ ☆Includes shipping☆