Bladderwrack & Gut Health
A closer look at one of VivoGut's two core marine botanicals.
A brown seaweed with a long coastal history
Bladderwrack (Fucus vesiculosus) is a species of brown seaweed found along the rocky coastlines of the North Atlantic and Baltic Sea. It has a long history of use in traditional coastal diets and folk wellness practices, particularly in Northern Europe, where it was valued both as a food source and for its mineral content.
Alginic acid and natural iodine
Bladderwrack is naturally rich in alginic acid, a soluble fiber compound with a soothing, gel-like texture, along with a naturally occurring concentration of iodine. In VivoGut, it's included as one of two marine botanicals (alongside kelp) that give the formula its "ancient underwater" character — chosen specifically for gut lining support and its contribution to healthy thyroid function through natural iodine content.
What the evidence actually shows
Iodine's role in thyroid hormone production, and the general importance of maintaining appropriate iodine intake, is well documented by health authorities. Research specific to bladderwrack itself as a standalone gut health intervention is more limited than iodine research generally — most of the evidence relates to its mineral and fiber content rather than dedicated clinical trials of bladderwrack extract. We think it's important to be upfront about that distinction.
Source: National Institutes of Health, Office of Dietary Supplements. Iodine — Fact Sheet for Health Professionals. ods.od.nih.gov/factsheets/Iodine-HealthProfessional
Who should be cautious
Because bladderwrack is a natural iodine source, anyone with a diagnosed thyroid condition should talk to a doctor before taking a supplement containing it. See our full Safety & Side Effects guide for more detail.