Here is some info on the ingredients:
Thyromine Thyroid Supplement Review: Does Thyromine Work?
I have never heard of the particular plant extract used in this formula. L-tyrosine is simply an amino acid. Nori will simply provide high levels of iodine and many trace minerals. And the bovine thyroid extract likely does carry a potential risk, albeit relatively minor, of Mad Cow disease, given the unknown source and probable lack of strict processing regulations or supervision. This latter extract has been available in healthfood stores for many years and is recommended by no one I've heard of. I do sympathize being a fellow sufferer of hypothyroidism.
Health supplements containing cow parts in danger
Please eat a well balanced diet and talk to a qualified physician about proper supplementation. Naturopaths in many states in the US can as well prescribe the appropriate, medically approved thyroid supplement for you, if you prefer to take a more alternative course. I know of no herbs myself, effective in treating this disorder. I have had the consultation of a knowledgeable naturopath in the past.
Good luck. Take care.