Evidence supporting the use of: Brown Algae
For the body system: Thyroid Gland

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Synopsis

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

Brown algae, particularly species such as kelp (Laminaria and Fucus), are used to support thyroid gland health primarily due to their high natural iodine content. Iodine is an essential micronutrient required for the synthesis of thyroid hormones (thyroxine/T4 and triiodothyronine/T3), which regulate metabolism and overall endocrine function. Scientific studies have demonstrated that populations with insufficient dietary iodine are at risk for hypothyroidism and goiter, and supplementing with iodine-rich foods like brown algae can prevent or correct deficiency (NIH ODS).

However, while the iodine in brown algae is scientifically validated as beneficial for those with iodine deficiency, there are cautions. The iodine content in seaweed is highly variable and sometimes excessive, potentially leading to thyroid dysfunction in sensitive individuals, especially in regions where iodine deficiency is uncommon or in those with pre-existing thyroid disorders (Leung et al., 2012). Furthermore, some brown algae may contain other bioactive compounds, such as fucoidans, but their direct effects on the thyroid are not well established in humans.

In summary, the use of brown algae to support the thyroid is scientifically justified when used as an iodine source for deficiency, but evidence does not strongly support its use in individuals with sufficient iodine intake, and excessive use may carry risks.

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