Natures Way - Bladderwrack Whole Thallus 580 mg. - 100 Vegetarian Capsules Natures Way Bladderwrack Whole Thallus is TRU-ID and non-GMO certified. Bladderwrack (Fucus vesiculosus) is a marine plant source of iodine. Natures Way bladderwrack (guaranteed to contain 0.04% iodine) is carefully tested
