Evidence supporting the use of: Seaweed (unspecified)
For the health condition: Goiter

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Synopsis

Source of validity: Scientific
Rating (out of 5): 4

Seaweed is used to support or treat goiter primarily due to its high natural iodine content. Goiter, an enlargement of the thyroid gland, is most commonly caused by iodine deficiency. Iodine is an essential micronutrient required for the synthesis of thyroid hormones. Historically, populations with low dietary iodine intake have had higher rates of goiter, and the introduction of iodine-rich foods or iodized salt has dramatically reduced its prevalence. Seaweed, particularly varieties like kelp and nori, contains high levels of iodine. Scientific reviews and clinical guidelines recognize iodine supplementation as an effective strategy for preventing and treating iodine-deficiency goiter (Zimmermann MB, Endocr Rev. 2009). However, it is important to note that excessive iodine intake from seaweed can also cause thyroid dysfunction, including both hyperthyroidism and hypothyroidism, especially in susceptible individuals. Therefore, while the use of seaweed is scientifically validated for iodine-deficiency goiter, its use should be carefully monitored to avoid iodine excess. The evidence rating is 4 because the link between iodine and goiter is well established, but variable iodine content in seaweed and potential for overdose warrant caution.

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