Synopsis

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

Dulse (Palmaria palmata) is a type of red seaweed traditionally consumed in coastal regions, especially in Ireland and parts of the North Atlantic. Its use to support the thyroid gland is primarily based on its high iodine content, as iodine is an essential nutrient required for the synthesis of thyroid hormones (thyroxine/T4 and triiodothyronine/T3). Historically, seaweeds like dulse have been used as natural dietary sources of iodine, particularly in populations with limited access to iodized salt or other iodine-rich foods. Insufficient iodine intake can lead to thyroid dysfunction, such as goiter and hypothyroidism. While the rationale for using dulse for thyroid health is based on its nutrient profile, specifically iodine, there is limited direct scientific research on dulse itself and its effects on the thyroid gland. Most scientific validation for iodine’s role in thyroid health comes from broader nutrition research rather than studies on dulse specifically. There is also the consideration that excessive iodine intake can be harmful, potentially causing thyroid dysfunction, so cautious use is recommended. In summary, the use of dulse to support thyroid function is justified by traditional use and supported by its iodine content, but there is a lack of direct clinical trials involving dulse and thyroid health, which limits the strength of evidence.

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