I'm not a Doctor but these are some of the herbs I've read about for Thyroid problems. I recommend consulting with a physician before taking any natural supplements.............
Bladderwrack is a herb traditionally used for an under active thyroid gland. It contains high amounts of iodine which may be responsible for stimulating production of thyroid hormones.
Bacopa is a herb that stimulates thyroid gland function and is also used for memory and concentration problems.
Withania, Licorice, Codonopsis and Siberian Ginseng provide adrenal stress support and promising results for healthy thyroid gland hormones.