Thyroid and immune system health are crucially dependent upon copper. As far as I can see now, copper deficiency is the most important factor in the development of hyperthyroidism. Virtually all hypers in the hyperthyroidism group have found that copper supplementation reduced their symptoms, usually within hours or a few days at most. Most have reported that within three to six months of beginning copper supplementation, they have been able to significantly reduce their intake of antithyroid drugs.
While copper is the big story in hyperthyroidism, it is not the whole story. If it were, it would have been discovered years ago. Proper copper metabolism interrelates with and depends upon many other nutrients.