Evidence supporting the use of: Dulse leaf
For the health condition: Goiter

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Synopsis

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

Dulse (Palmaria palmata) is a type of red seaweed historically used in various cultures, particularly in coastal regions of Europe and North America, as a food and folk remedy. Its traditional use for supporting or treating goiter is primarily attributed to its high iodine content. Goiter, an enlargement of the thyroid gland, is most commonly caused by iodine deficiency. In times and regions where iodized salt was unavailable, seaweeds like dulse provided a dietary source of iodine, and consuming them was believed to help prevent or reduce goiter.

However, while this rationale aligns with the understanding of iodine’s role in thyroid health, there is limited direct scientific evidence specifically evaluating dulse for the treatment of goiter. Most of the support comes from its traditional use and its known nutritional profile, rather than from clinical trials or robust scientific studies. The value rating of 2 reflects that while there's a clear biochemical basis (iodine content), and a strong tradition, there is a lack of modern controlled studies on dulse itself for this use. Moreover, excessive intake of iodine-rich seaweed can sometimes cause thyroid dysfunction, so caution is warranted. In modern medicine, iodine supplementation or iodized salt is the preferred method for preventing and treating iodine-deficiency goiter.

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