Evidence supporting the use of: Seaweed (unspecified)
For the body system: Thyroid Gland

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Synopsis

Source of validity: Scientific
Rating (out of 5): 3

Seaweed, particularly varieties such as kelp, nori, and wakame, is used to support thyroid gland function due to its naturally high iodine content. Iodine is an essential micronutrient required for the synthesis of thyroid hormones (thyroxine/T4 and triiodothyronine/T3), which regulate metabolism and are critical for normal growth and development. Scientific studies have established that iodine deficiency can lead to hypothyroidism and the development of goiter. The World Health Organization and numerous endocrinology texts cite seaweed as a rich and effective dietary source of iodine, making it beneficial in populations where iodine deficiency is prevalent. However, excessive intake of iodine, particularly from seaweed supplements or high consumption of certain seaweeds (such as kelp), can also disrupt thyroid function, leading to hyperthyroidism or thyroiditis in sensitive individuals. While the traditional use of seaweed in East Asian diets for general health is longstanding, the scientific validation for its thyroid-supporting effect is specifically tied to its iodine content. Thus, seaweed's use for thyroid support is scientifically justified with moderate evidence, especially in the context of iodine deficiency, but should be approached with caution due to the potential for excessive intake.

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