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

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Synopsis

Source of validity: Scientific
Rating (out of 5): 4

Shellfish are a rich natural source of iodine, zinc, and selenium—three minerals essential for healthy thyroid function. The thyroid gland uses iodine to produce thyroid hormones (T3 and T4), which regulate metabolism, growth, and energy. Selenium is required for the conversion of T4 to the more active T3 form, and zinc also plays a role in synthesizing and regulating these hormones. Scientific studies have shown that iodine deficiency can lead to hypothyroidism and goiter, and that both selenium and zinc deficiencies can adversely affect thyroid hormone metabolism and immune function within the gland. Shellfish, such as oysters, shrimp, and clams, provide highly bioavailable forms of these minerals. For example, oysters are among the best dietary sources of zinc, while shrimp and other shellfish contain meaningful amounts of iodine and selenium. While supplementation should be approached with caution due to the risk of excessive intake (especially for iodine), moderate shellfish consumption as part of a balanced diet is supported by scientific evidence as a way to help maintain adequate levels of these thyroid-supportive nutrients. However, individuals with shellfish allergies or specific thyroid disorders (such as autoimmune thyroid disease) should consult healthcare providers before increasing shellfish intake.

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