Condition
Treatment Support
thyroid regulator, iodine source
Application
tea, powder in capsules
Bladderwrack
(Fucus vesiculosis)
Botanical Information
A seaweed with flat, forked green to black fronds, a distinct midrib, and oval bladders. The leaves are crunchy, sour, and mucilaginous-tasting when fresh; they can be used in salads.
Working with Bladderwrack
Part(s) Used
Thallus
Herb Forms
Bulk herb, powder, capsules
Christopher Hobbs:
“Bladderwrack is popular for its anti-obesity effects and is a good source of trace elements, particularly iodine. It is thought that bladderwrack stimulates the thyroid gland, increasing basal metabolism. It is sometimes used locally for symptoms of rheumatism.
Bladderwrack has a taste of SALTY and a temperature of COOL.”
Historical Uses
Historically, bladderwrack was used to treat goiter (an enlargement of the thyroid gland), as it is rich in iodine, which supports thyroid function. Additionally, it was used for general health, joint pain, skin conditions, and digestive issues.
Modern Clinical Uses
Today, herbalists and naturopaths recommend bladderwrack mainly for thyroid health due to its iodine, which may help regulate underactive thyroid function (hypothyroidism). It’s also used to support weight management, enhance skin health, and as a source of antioxidants. In skincare, bladderwrack extracts are used for their anti-inflammatory and moisturizing properties.
Chemistry
Bladderwrack contains iodine, alginates, fucoidans (sulfated polysaccharides), phenolic compounds, and a variety of minerals and vitamins. Fucoidan, in particular, has drawn scientific interest due to its potential anti-inflammatory and immune-boosting properties.
Pharmacology
The iodine content in bladderwrack affects thyroid function by supporting the production of thyroid hormones, which regulate metabolism. Alginates from bladderwrack are also known for their ability to absorb water, making them useful in gastrointestinal health, while fucoidans may have anticancer, antiviral, and anti-inflammatory effects in preclinical studies.
Clinical Trials
Clinical research on bladderwrack is limited. Few studies have assessed its efficacy for thyroid health, but results are promising for its antioxidant and anti-inflammatory properties, primarily from fucoidans and other compounds. More extensive clinical trials are needed to substantiate its potential therapeutic benefits.
Summary
Bladderwrack remains valued in modern herbal medicine for its iodine and antioxidant content, supporting thyroid function, skin health, and potential immune benefits. However, its effectiveness and safety profile require more in-depth clinical research, especially considering the risks related to iodine intake and heavy metal contamination.
Generated by ChatGPT; edited by Christopher Hobbs.
Cautions
Bladderwrack is generally safe in moderate amounts, but its iodine content can be a concern for people with hyperthyroidism or thyroid autoimmune diseases. Excessive intake may disrupt thyroid function and is contraindicated for those on thyroid medications. Heavy metal contamination (such as arsenic or mercury) can be a risk, as seaweeds can absorb these from the environment, so it is essential to source bladderwrack from clean waters. As with any supplement, it should be used under professional guidance, particularly for individuals with thyroid conditions.
Use sparingly if you have or have had a goiter. Avoid during pregnancy. Do not use long-term.
Conditions treated with Bladderwrack
Condition
Treatment Support
Application
Condition
Treatment Support
hormonal stimulant
Application
capsules
The information given here is designed to help you make informed choices about your health. The information is drawn from numerous sources—both traditional medicine practice, from the clinical experience of many herbalists currently practicing, and supported by decades of scientific research from the author. The research most consulted includes human clinical trials that help to determine the most effective and safe herbs for various needs, the best doses, and types of preparations.
The information offered in this database is not intended as a substitute for any that may have been prescribed by your health practitioner or physician.
