Evidence supporting the use of: Ascophyllum nodosum
For the body system: Thyroid Gland

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Synopsis

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

Ascophyllum nodosum, commonly known as rockweed or knotted wrack, is a brown seaweed traditionally used in herbal medicine, particularly for supporting thyroid health. The primary reason for its association with thyroid support is its naturally high iodine content. Iodine is an essential micronutrient required for the synthesis of thyroid hormones, and dietary deficiency can lead to thyroid dysfunction such as goiter and hypothyroidism. Historically, seaweeds like Ascophyllum nodosum have been consumed in coastal regions to help prevent iodine deficiency, long before the introduction of iodized salt. However, while the traditional use is well documented, direct scientific evidence specifically linking Ascophyllum nodosum supplementation to improved thyroid function in humans is limited. Most studies focus on its iodine content rather than unique bioactive compounds or clinical outcomes. There is some preliminary research into its potential roles in supporting metabolism and modulating other health markers, but these are not specific to thyroid health. In summary, the use of Ascophyllum nodosum for thyroid support is grounded in traditional practice due to its iodine richness. Scientific validation is limited to the general role of iodine in thyroid health rather than to clinical studies on Ascophyllum nodosum itself. Excessive iodine intake can also negatively affect thyroid function, so supplementation should be approached with caution and under professional guidance.

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