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

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Synopsis

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

Sea vegetables, such as kelp, nori, dulse, and wakame, are often used to support thyroid health primarily due to their high iodine content. Iodine is an essential trace mineral required for the synthesis of thyroid hormones (thyroxine/T4 and triiodothyronine/T3), which regulate metabolism and other important bodily functions. Scientific evidence indicates that iodine deficiency can lead to hypothyroidism and goiter, and sea vegetables are among the richest natural sources of dietary iodine. Several clinical and population studies have demonstrated that adequate iodine intake from food sources, including sea vegetables, helps maintain healthy thyroid function, especially in regions where iodine deficiency is common.

However, while the scientific rationale for using iodine-rich sea vegetables to support the thyroid is strong, the evidence supporting the use of unspecified or mixed sea vegetables as a general supplement is less robust. There are concerns about excessive iodine intake from some varieties (notably kelp), which can lead to thyroid dysfunction, particularly in susceptible individuals. Additionally, sea vegetables may accumulate heavy metals from polluted waters. Overall, the use of sea vegetables for thyroid support is scientifically validated in the context of correcting deficiency, but more research is needed to determine optimal types and amounts for supplementation.

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