Bladderwrack, which is a brown seaweed, also known as Fucus vesiculosus, has been used historically in a variety of applications. It is known to be a good source of dietary fiber used in herbal medicine and herbal tea to help remedy constipation or thyroid problems. This sea vegetable and herb can be taken in the form of dietary supplement capsules or consumed as a powder. Bladderwrack can be found around North America, the North Sea, and the Baltic Sea. If you are looking to potentially improve healthy thyroid function or reduce constipation, bladderwrack powder is the herbal medicine for you.