Evidence supporting the use of: Kelp
For the health condition: Goiter

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Synopsis

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

Kelp is justified for use in treating or supporting goiter primarily due to scientific understanding, though with moderate evidence. Goiter, an enlargement of the thyroid gland, is most commonly caused by iodine deficiency. Kelp, a type of brown seaweed, is naturally rich in iodine—a key element required for the synthesis of thyroid hormones. Historically, populations living far from the sea and with low dietary iodine experienced endemic goiter. The introduction of iodine-rich foods, such as kelp or iodized salt, significantly reduced goiter incidence in these populations. Numerous studies and health organizations, including the World Health Organization (WHO), acknowledge iodine supplementation as an effective preventive and therapeutic measure for iodine-deficiency-related goiter. However, the use of kelp specifically is less standardized than iodized salt, as kelp's iodine content can vary greatly and excessive intake may lead to thyroid dysfunction (hyperthyroidism or hypothyroidism). While kelp has a strong rationale for use in cases of iodine-deficiency goiter, it is not a recommended therapy for goiters caused by other factors, such as autoimmune thyroid disease or thyroid nodules. In summary, the use of kelp to support goiter is scientifically grounded in its iodine content, but caution and medical supervision are advised due to potential risks of overconsumption.

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