Last Updated: September 28 2022

Bladderwrack is a species of seaweed known as Fucus vesiculosus that serves as a foodstuff and a source of Fucoxanthin, it is though to increase the metabolism via the thyroid but that is due to fixing iodine deficiencies historically.

Bladderwrack is most often used for


Bladderwrack (formal name Fucus Vesiculosis) is a brown seaweed which is a good source of iodine (the mineral needed for proper thyroid function) and of various L-fucose compounds.

Said L-fucose compounds can be seen as generally being anti-obesity, anti-inflammatory, anti-oxidant, and anti-carcinogenic. There are also some implications of them being anti-viral and anti-diabetic.

Benefits can be seen from ingesting brown seaweeds as foodstuffs, or by consuming the L-fucose compounds or the seaweed itself in supplemental form; although the latter should be taken alongside food.

What else is Bladderwrack known as?
Note that Bladderwrack is also known as:
  • Fucus Vesiculosis
Dosage information

Although there is not a large amount of evidence currently, the evidence in humans has noted that 500mg of bladderwrack (basic extract of the seaweed, not concentrated) appears to be bioactive. This is a lower dose than the 4,000mg used in studies on Ascophyllum nodosum, and due to their similar composition the ideal range may be somewhere in between these two doses (or above 4,000mg).

Supplements Demystified: Get Our Unbiased, Evidence-Based Guide

Examine Database: Bladderwrack
What works and what doesn't?

Unlock the full potential of Examine

Get started

Don't miss out on the latest research

1.^Moro CO, Basile GObesity and medicinal plantsFitoterapia.(2000 Aug)
2.^Saha M, Rempt M, Grosser K, Pohnert G, Weinberger FSurface-associated fucoxanthin mediates settlement of bacterial epiphytes on the rockweed Fucus vesiculosusBiofouling.(2011 Apr)
3.^Kwak KW, Cho KS, Hahn OJ, Lee KH, Lee BY, Ko JJ, Chung KHBiological effects of fucoidan isolated from Fucus vesiculosus on thrombosis and vascular cellsKorean J Hematol.(2010 Mar)
5.^Wang T, Jónsdóttir R, Liu H, Gu L, Kristinsson HG, Raghavan S, Olafsdóttir GAntioxidant Capacities of Phlorotannins Extracted from the Brown Algae Fucus vesiculosusJ Agric Food Chem.(2012 Jun 5)
7.^Holan ZR, Volesky BBiosorption of lead and nickel by biomass of marine algaeBiotechnol Bioeng.(1994 May)
8.^Ryan S, McLoughlin P, O'Donovan OA comprehensive study of metal distribution in three main classes of seaweedEnviron Pollut.(2012 Aug)
9.^Steevensz AJ, Mackinnon SL, Hankinson R, Craft C, Connan S, Stengel DB, Melanson JEProfiling phlorotannins in brown macroalgae by liquid chromatography-high resolution mass spectrometryPhytochem Anal.(2012 Sep)
11.^Duarte ME, Cardoso MA, Noseda MD, Cerezo ASStructural studies on fucoidans from the brown seaweed Sargassum stenophyllumCarbohydr Res.(2001 Jul 19)
15.^Irhimeh MR, Fitton JH, Lowenthal RM, Kongtawelert PA quantitative method to detect fucoidan in human plasma using a novel antibodyMethods Find Exp Clin Pharmacol.(2005 Dec)
16.^Tokita Y, Nakajima K, Mochida H, Iha M, Nagamine TDevelopment of a fucoidan-specific antibody and measurement of fucoidan in serum and urine by sandwich ELISABiosci Biotechnol Biochem.(2010)
18.^Kim MJ, Chang UJ, Lee JSInhibitory effects of Fucoidan in 3T3-L1 adipocyte differentiationMar Biotechnol (NY).(2009 Sep-Oct)
19.^Park MK, Jung U, Roh CFucoidan from marine brown algae inhibits lipid accumulationMar Drugs.(2011)
21.^Shimizu H, Ross RK, Bernstein L, Pike MC, Henderson BESerum oestrogen levels in postmenopausal women: comparison of American whites and Japanese in JapanBr J Cancer.(1990 Sep)
22.^Key TJ, Chen J, Wang DY, Pike MC, Boreham JSex hormones in women in rural China and in BritainBr J Cancer.(1990 Oct)
24.^Lu LJ, Anderson KE, Grady JJ, Kohen F, Nagamani MDecreased ovarian hormones during a soya diet: implications for breast cancer preventionCancer Res.(2000 Aug 1)
25.^Li B, Lu F, Wei X, Zhao RFucoidan: structure and bioactivityMolecules.(2008 Aug 12)
26.^Cumashi A, Ushakova NA, Preobrazhenskaya ME, D'Incecco A, Piccoli A, Totani L, Tinari N, Morozevich GE, Berman AE, Bilan MI, Usov AI, Ustyuzhanina NE, Grachev AA, Sanderson CJ, Kelly M, Rabinovich GA, Iacobelli S, Nifantiev NE; Consorzio Interuniversitario Nazionale per la Bio-Oncologia, ItalyA comparative study of the anti-inflammatory, anticoagulant, antiangiogenic, and antiadhesive activities of nine different fucoidans from brown seaweedsGlycobiology.(2007 May)
28.^Dürig J, Bruhn T, Zurborn KH, Gutensohn K, Bruhn HD, Béress LAnticoagulant fucoidan fractions from Fucus vesiculosus induce platelet activation in vitroThromb Res.(1997 Mar 15)
30.^Nishino T, Nagumo TAnticoagulant and antithrombin activities of oversulfated fucansCarbohydr Res.(1992 May 22)
31.^Sato M, Oba T, Yamaguchi T, Nakano T, Kahara T, Funayama K, Kobayashi A, Nakano TAntihypertensive effects of hydrolysates of wakame (Undaria pinnatifida) and their angiotensin-I-converting enzyme inhibitory activityAnn Nutr Metab.(2002)
32.^Ara J, Sultana V, Qasim R, Ahmad VUHypolipidaemic activity of seaweed from Karachi coastPhytother Res.(2002 Aug)
33.^Neglia CI, Cohen HJ, Garber AR, Ellis PD, Thorpe SR, Baynes JW13C NMR investigation of nonenzymatic glucosylation of protein. Model studies using RNase AJ Biol Chem.(1983 Dec 10)
34.^Petersen DR, Doorn JAReactions of 4-hydroxynonenal with proteins and cellular targetsFree Radic Biol Med.(2004 Oct 1)
37.^Münch G, Thome J, Foley P, Schinzel R, Riederer PAdvanced glycation endproducts in ageing and Alzheimer's diseaseBrain Res Brain Res Rev.(1997 Feb)
40.^Cederholm J, Wibell LInsulin release and peripheral sensitivity at the oral glucose tolerance testDiabetes Res Clin Pract.(1990 Oct)
41.^Lamela M, Anca J, Villar R, Otero J, Calleja JMHypoglycemic activity of several seaweed extractsJ Ethnopharmacol.(1989 Nov)
46.^Heo SJ, Yoon WJ, Kim KN, Ahn GN, Kang SM, Kang DH, Affan A, Oh C, Jung WK, Jeon YJEvaluation of anti-inflammatory effect of fucoxanthin isolated from brown algae in lipopolysaccharide-stimulated RAW 264.7 macrophagesFood Chem Toxicol.(2010 Aug-Sep)
48.^Morita K, Nakano TSeaweed accelerates the excretion of dioxin stored in ratsJ Agric Food Chem.(2002 Feb 13)
49.^Al-Bader T, Byrne A, Gillbro J, Mitarotonda A, Metois A, Vial F, Rawlings AV, Laloeuf AEffect of cosmetic ingredients as anticellulite agents: synergistic action of actives with in vitro and in vivo efficacyJ Cosmet Dermatol.(2012 Mar)
50.^Fujimura T, Tsukahara K, Moriwaki S, Kitahara T, Sano T, Takema YTreatment of human skin with an extract of Fucus vesiculosus changes its thickness and mechanical propertiesJ Cosmet Sci.(2002 Jan-Feb)
51.^Fujimura T, Shibuya Y, Moriwaki S, Tsukahara K, Kitahara T, Sano T, Nishizawa Y, Takema YFucoidan is the active component of fucus vesiculosus that promotes contraction of fibroblast-populated collagen gelsBiol Pharm Bull.(2000 Oct)
52.^Chung HJ, Jeun J, Houng SJ, Jun HJ, Kweon DK, Lee SJToxicological evaluation of fucoidan from Undaria pinnatifidain vitro and in vivoPhytother Res.(2010 Jul)
54.^Zhuang C, Itoh H, Mizuno T, Ito HAntitumor active fucoidan from the brown seaweed, umitoranoo (Sargassum thunbergii)Biosci Biotechnol Biochem.(1995 Apr)
56.^Gideon TP, Rengasamy RToxicological evaluation of fucoidan from Cladosiphon okamuranusJ Med Food.(2008 Dec)