Bladderwrack is a seaweed found on the coasts of the North Sea, the western Baltic Sea, and the Atlantic and Pacific Oceans.. It was the original source of iodine, discovered in 1811, and was used extensively to treat goitre, a swelling of the thyroid gland related to iodine deficiency. Celebrities such as Posh Spice , Britney Spears and Paris Hilton can be found using Bladderwrack as a dietary supplement.
