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

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Synopsis

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

Kelp, a type of seaweed, is often used to support the thyroid gland primarily due to its high iodine content. Iodine is an essential trace element required for the synthesis of thyroid hormones, which regulate metabolism and other critical bodily functions. Scientific validation for the use of kelp in thyroid health is based on the well-established role of iodine in preventing and treating iodine deficiency disorders, particularly goiter and hypothyroidism. Studies have shown that populations with insufficient iodine intake benefit from dietary sources of iodine, such as kelp, to maintain adequate thyroid function (Zimmermann MB, 2012). However, the evidence is less robust regarding kelp supplementation in individuals with sufficient iodine intake, as excess iodine can potentially trigger or exacerbate thyroid dysfunction, particularly in those with pre-existing thyroid conditions (NIH ODS, Iodine Fact Sheet). There is little evidence supporting kelp's efficacy for thyroid support beyond its iodine content, and quality control issues regarding variable iodine levels in kelp products are a concern. In summary, while there is scientific rationale for kelp's use in supporting thyroid health due to its iodine content, its use should be approached with caution and individualized to avoid excessive iodine intake.

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