Bladderwrack (Fucus vesiculosus) has a long history of use in traditional herbal medicine, particularly in European and coastal cultures. It is most commonly recognized for its high iodine content and its use in supporting thyroid function, but it has also been used traditionally to support joint health and address joint discomfort, especially in the context of conditions like rheumatism and arthritis.

The traditional rationale for using bladderwrack for joints is largely based on its content of fucoidan, a type of sulfated polysaccharide, and other phytochemicals that are believed to exhibit anti-inflammatory properties. Historical texts and ethnobotanical sources mention its application as a topical poultice or its inclusion in decoctions for easing joint stiffness and swelling. However, these uses are based on anecdotal evidence and traditional practices rather than modern clinical trials.

Scientific validation for bladderwrack’s efficacy in supporting joint health is minimal. While some in vitro and animal studies have suggested that fucoidan and other compounds in bladderwrack have anti-inflammatory effects, there is a lack of robust clinical trials directly examining its impact on human joint health or arthritis symptoms. Therefore, its use for joint support remains primarily rooted in traditional herbalism rather than strong scientific evidence.