Synopsis

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

Dulse leaf (Palmaria palmata) has been used traditionally as a food and folk remedy, especially in coastal regions of the North Atlantic. Its use in support of the thyroid gland is primarily due to its iodine content. Iodine is an essential trace element required for the synthesis of thyroid hormones (thyroxine/T4 and triiodothyronine/T3), and iodine deficiency is a well-established cause of thyroid dysfunction, particularly hypothyroidism and goiter. Traditional herbal and nutritional practices have recommended various seaweeds, including dulse, as dietary sources of iodine.

However, while the traditional rationale is sound in the context of iodine deficiency, there is limited direct scientific research specifically validating dulse leaf itself (rather than seaweed or iodine in general) as a therapeutic agent for thyroid health. Most scientific literature focuses on the general role of iodine and the potential risks of excessive iodine intake from seaweeds, which can also negatively affect thyroid function. Thus, while dulse is a source of dietary iodine, scientific evidence supporting its specific use for thyroid support is limited, and most recommendations are based on tradition and extrapolation from iodine’s role in thyroid physiology.

In summary, dulse leaf’s use for thyroid support is justified by traditional use due to its iodine content, but direct scientific validation is lacking, and caution is advised regarding iodine dosing from seaweed products.

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