Evidence supporting the use of: Bladderwrack (Kelp)
For the body system: Hair

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Synopsis

Source of validity: Traditional
Rating (out of 5): 2

Bladderwrack (Fucus vesiculosus), often referred to as a form of kelp, has a long history of traditional use in herbal medicine, particularly for supporting thyroid health due to its iodine content. This, in turn, has led to its association with hair health, as thyroid dysfunction (especially hypothyroidism) is known to contribute to hair thinning and loss. In various traditional systems, including Western herbalism, bladderwrack has been recommended to support hair growth by providing trace minerals, especially iodine, which is essential for thyroid hormone synthesis.

However, scientific evidence directly linking bladderwrack or kelp to improved hair growth or health is limited. Most claims are extrapolated from its nutritional profile and the indirect relationship between thyroid function and hair. There are no large-scale, well-controlled clinical trials demonstrating that bladderwrack supplementation alone benefits hair growth in healthy individuals. Its efficacy is largely rooted in tradition and the logical connection between correcting iodine deficiency (which can cause hair loss) and potential improvements in hair health.

Because of this, the use of bladderwrack for supporting the hair body system can be considered “traditional,” with a moderate evidence rating, primarily based on its nutritional content and its historical use rather than robust scientific validation.

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