I have Graves' disease and hypo without meds from RAI. I currently take synthroid. It took 3 years but I finally feel 80% I would say. My hair fell out when I was hyper and hypo. Now it has stabilized. My strands are thick and shiny doesn't feel as thin. My hair was dryer and flatter when hypo and greasy when hyper. I'm hoping to be able to grow really long hair.