Fucus spp of brown seaweeds have been used as treatment for thyroid disorders . The thyroid hormone present in Fucus is Di-Iodothyronine (DIT); it is weakly active if al all as a thyroid hormone in the mammalian body. Two DIT molecules are condensed in an elegant esterification reaction to produce tetraiodotyrosine(T4, Thyroxine). The organically bound iodine in Fucus may enhance T4 production by providing some prefabricated portions of T4. I have not seen any studies tracing Fucus-sourced DIT to either the thyroid gland or circulating T4.
The therapeutic effects of using powdered Fucus, 3-5 grams daily resemble the therapeutic effects of thyroxine medications: shrinking of goiters, weight loss, resolution of symptomatic non-autoimmune hypothyroidism, return of vim and vigor, lessening of psychiatric disruptions, and resolution of eczemas. This is especially true of women enduring postpartum physiological depression after several years of being pregnant and nursing one or more children.
I have seen no reports of thyrotoxicity from Fucus consumption.
Women with low thyroid function, according to thyroid panel blood tests report improved test results.
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