Evidence supporting the use of: Laminara
For the body system: Thyroid Gland
Synopsis
Source of validity: Scientific
Rating (out of 5): 3
Laminaria (commonly known as kelp) is used to support the thyroid gland primarily due to its high natural iodine content. Iodine is an essential micronutrient required for the synthesis of thyroid hormones, which regulate metabolism, growth, and development. Scientific research has established that dietary iodine deficiency is a leading cause of hypothyroidism and goiter. Consequently, Laminaria and other iodine-rich seaweeds have been studied as dietary supplements for populations at risk of iodine deficiency. Supplementation with iodine from seaweeds can improve thyroid hormone levels in iodine-deficient individuals. However, the iodine content of Laminaria can be highly variable, and excessive intake can lead to thyroid dysfunction, including hyperthyroidism or thyroid autoimmunity. There is moderate evidence supporting the use of Laminaria specifically for addressing iodine deficiency-related thyroid issues, but insufficient evidence for its benefit in individuals with adequate iodine status or for other thyroid conditions. Clinical guidelines recommend careful monitoring of iodine intake, as both deficiency and excess can be harmful. In summary, the scientific rationale for Laminaria's use in thyroid support is well-established in the context of iodine deficiency, but not as a general thyroid tonic for all individuals.
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