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

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Synopsis

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

Sea vegetation, particularly species such as kelp, bladderwrack, and other brown seaweeds, is scientifically recognized for its high iodine content. Iodine is an essential micronutrient required for the synthesis of thyroid hormones (thyroxine/T4 and triiodothyronine/T3), which are critical for regulating metabolism and overall thyroid function. Iodine deficiency is a well-known cause of hypothyroidism and goiter, and seaweeds are among the richest natural sources of dietary iodine. Several clinical and nutritional studies have documented the bioavailability of iodine from seaweed and its capacity to improve iodine status in populations with inadequate dietary intake. However, the iodine content in sea vegetation can vary widely, and excessive intake may lead to thyroid dysfunction, including hyperthyroidism or thyroiditis, especially in susceptible individuals. While traditional use of seaweed for thyroid health exists in some cultures, contemporary support for its use is grounded in the well-established physiological requirement for iodine. Therefore, moderate consumption of iodine-rich sea vegetation can support normal thyroid function, but care must be taken to avoid overconsumption. Other purported thyroid benefits of seaweed, such as the effects of unique polysaccharides or secondary metabolites, are less well-established and lack robust clinical validation.

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