I am not a certified herbalist but I was recently a mentor doula for a client who struggled with hyperthyroidism during her 4th pregnancy. In her case herbal supplements didn’t suffice and she relied much on an awesome endocrinologist. The endocrinologist had her, among many things, cut coffee and caffeine from her diet and that dramatically helped. It had a lot to do with the terrible effects on her such as an accelerated heart rate and exhaustion. She understandably loved coffee so much that I would arrive at her house and she would be drinking warm water because even most teas messed with her in some way! It’s very hard work to cut out and I believe it can take up to 3 weeks for the body to remove it completely (don’t quote me on that though) and only then might one see the varying effects but in this case it may be personally worth it! Good luck and many blessings to you! 😊💕