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

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Synopsis

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

Kelp is a type of seaweed rich in iodine, a trace element essential for the synthesis of thyroid hormones (thyroxine/T4 and triiodothyronine/T3). Iodine deficiency can lead to hypothyroidism and goiter, and iodine supplementation is a recognized strategy for prevention and treatment of these conditions. Several studies and public health authorities, including the World Health Organization, have established the link between dietary iodine and thyroid health. Kelp, being a natural source of iodine, has therefore been used in both traditional and modern interventions targeting thyroid dysfunction, particularly in areas where iodine deficiency is prevalent.

However, evidence supporting kelp specifically (as opposed to iodine in general) is less robust. The iodine content in kelp can vary widely, and excessive intake can lead to thyroid dysfunction, including both hypothyroidism and hyperthyroidism. Clinical guidelines do not typically recommend kelp supplementation for thyroid support due to this variability and the risk of excessive iodine exposure. Most scientific support focuses on iodine itself rather than kelp as a supplement.

In summary, there is scientific validation for the use of iodine in supporting thyroid health, and kelp is a natural source of iodine, but the evidence for kelp supplementation per se is moderate and must be balanced against the risks of overconsumption.

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