I myself had (have) Grave’s disease and had my thyroid radiated so this news was especially interesting. 

German researchers hve found rats exposed to a chemical, 4MBC found in most brands of sunscreen had raised levels of thyroid stimulating hormones and heavier thyroid glands.  Yet another chemical benzophenone 2 was also found to alter thyroid hormone levels, but the effect was reversed by other chemicals present in sunscreens.

I look forward to this study receiving more attention.