What is bladderwrack powder? Our bladderwrack powder is ground from organic Fucus vesiculosus, a type of brown seaweed picked along the cool Atlantic shores. Bladderwrack got its name from its thalli, or "bladders," that fill with air to keep the seaweed afloat. This particular seaweed powder has a high iodine level and can be added to cooking recipes and spice mixes. Bladderwrack powder can even be used in body care recipes. Other names for bladderwrack include dyer’s focus, red focus, and rockwrack. It is part of the Fucaceae family. Bladderwrack Powder Benefits: ◉ Relieves constipation and diarrhea. ◉ May help with stomach problems. Buy it from the natural health food store, Alive Herbals.