Evidence supporting the use of: Brown seaweed (mixed)
For the body system: Thyroid Gland

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Table of Contents

Synopsis

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

Brown seaweed (such as kelp, bladderwrack, and wakame) is often used to support the thyroid gland because it is a rich natural source of iodine. Iodine is an essential micronutrient required for the synthesis of thyroid hormones—thyroxine (T4) and triiodothyronine (T3)—which regulate metabolism, growth, and development. Scientific studies confirm that moderate iodine consumption is necessary for normal thyroid function, and dietary deficiency can lead to hypothyroidism and goiter. Brown seaweed has been traditionally consumed in coastal regions for this purpose and continues to be included in supplements aimed at thyroid support.

However, the scientific evidence supporting the use of brown seaweed (mixed species) specifically for thyroid health is moderate. While the iodine content is well-established, the amount of iodine can vary widely between seaweed species and batches, sometimes leading to excessive iodine intake, which may trigger thyroid dysfunction in susceptible individuals. Additionally, certain compounds in brown seaweed (such as fucoxanthin and phlorotannins) are under investigation for their potential effects on thyroid and metabolic health, but evidence is still preliminary.

In summary, the use of brown seaweed to support the thyroid gland is scientifically justified based on its iodine content, but care should be taken regarding dosage due to the risk of excessive iodine intake. For those with thyroid conditions or at risk of iodine sensitivity, medical supervision is recommended.

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