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Bladderwrack, also called rockweed, black tang, red fucus, and various other names, is an edible brown seaweed that grows along the coasts of the Atlantic and Pacific oceans and the North and Baltic seas. Like many other seaweeds such as kelp, nori, and kombu, bladderwrack is beloved – especially in East Asia – for its medicinal properties. Indeed, it was the original source of iodine in Europe, and was used in the early nineteenth century…