Fucus is also used to wean mildly hypothyroid patients off thyroid        hormone medication.
This will only work if the thyroid gland mass must be capable of making  T4 and T3 in sufficient quantities to supply body needs. Those without a thyroid gland may be helped by the iodine present in Fucus, alleviating the need        to mine thyroid medications for iodine. This may also explain in part the alleged weight loss results from ingesting Fucus; to wit, up regulation of basal body metabolic rate from iodine alone.