Bladderwrack (Fucus vesiculosus) is a type of brown seaweed that’s tied to traditional medicine. It’s also known as rockweed, red fucus, dyers fucus, rock wrack, black tang, and bladder fucus (1Trusted Source).
Growing up to 35 inches (90 cm) tall, bladderwrack grows along the coastlines of the Atlantic and Pacific Oceans, the North and Baltic Seas, and various waters in Canada and the United States (1Trusted Source).
Traditional medicinal practices have used it for centuries to treat an array of conditions, such as iodine deficiency, obesity, joint pain, aging skin, digestive issues, urinary tract infection, and thyroid dysfunction, including hyperthyroidism, hypothyroidism, and goiter development.
Rich in vitamins, minerals, and antioxidants, many people believe that bladderwrack’s impressive nutrient profile can provide health benefits, though critics argue the claims are ahead of the research (1Trusted Source).
Written by Katey Davidson, MScFN, RD on July 8, 2020 — Medically reviewed by Miho Hatanaka, RDN, L.D.
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