As noted above if you wish to do some research on thyroid here are 3 great sources:
1. Stop the Thyroid Madness™ - Hypothyroidism and thyroid mistreatment
2. http://www.tiredthyroid.com/
Great simple to understand articles.
Get her book.... “Tired Thyroid: From Hyper to Hypo to Healing—Breaking the TSH Rule”
3. Search for "thyroid" - Dr. Westin Childs | Thyroid & Health Supplements That Work
The Complete Hypothyroidism User Guide for Patients (2018 Edition)
A LOT of good articles and a great youtube page.
Spend time here looking around.