Bladder Fucus, commonly known as sea bladder or bladderwrack, is a brown seaweed found in marine environments. The plant derives its name from the air sacs present on its fronds that help it float on the surface of the water. Bladder Fucus has several synonyms, including Fucus vesiculosus, Alga blennorrhiza, and Ascophyllum nodosum. It is used in several traditional medicines for improving thyroid function, boosting metabolism, and for its anti-inflammatory and antioxidant properties. It is also a common ingredient in cosmetics and skin care products. Bladder Fucus is a vital component of marine ecosystems, providing food and shelter for many marine organisms.