If anyone is helped by what I posted I am happy.
I will post links for sources later.
Here are links to the three formulas which are considered to help thyroid function (among many other benefits), both tablet form and powder. I prefer powdered herbs mixed with a little hot water and a teaspoon of honey; hub prefers tablets.
Kanchanar Tablets
https://www.amazon.com/Banyan-Botanicals-Kanchanar-Guggulu-Energizing/dp/B0058AAHQO/ref=sr_1_8
Powder
https://www.amazon.com/Certified-Vadik-Herbs-cleansers-Elimination/dp/B07L6DGM4H/ref=sr_1_1
Triphala Guggulu
Tablets
https://www.amazon.com/Banyan-Botanicals-Triphala-Guggulu-Detoxification/dp/B000Q48DGS/ref=sr_1_6
Kaishore Guggulu
Tablets
https://www.amazon.com/dp/B0058AAHLO?ref=nb_sb_ss_w_as-reorder_k0_1_16&=&crid=277L2NQDDFH1B&=&sprefix=kaishore+guggulu
Powder
https://www.amazon.com/Banyan-Botanicals-Kaishore-Guggulu-Certified/dp/B00R6KRSMA/ref=sr_1_1