Bladderwrack - Chiefly used as the principle agent in ‘cures’ for obesity. The plant appears to raise the metabolic rate by increasing hormone production by the thyroid gland, but the increase may be limited to poorly functioning thyroids. This seaweed requires an hour of simmering or twenty minutes in the pressure cooker, to tenderize it. It’s very strong-tasting. Use it sparingly in soups and stews, or put a small amount of precooked rockweed in the blender when you make sauces.     Buy/view Bladderwrack