I came across this study today:
pubmed.ncbi.nlm.nih.gov/259...
In animals, this study shows that phthalates decrease T4, T3, and TRH but not TSH.
Which is interesting as we know that thyroid medications are often prescribed based on TSH. So if phthalates are messing with free T3 and free T4 but not TSH, these people are likely missed out by our healthcare system.