I have been shedding more hair the last few years. I am on synthroid. Not sure if this is the cause, but what stopped it for me was 50MG a day of Iodoral. I've been using Iodoral for nearly a year at smaller doses, but when I hit the 50MG dose is when I noticed it had totally stopped. I barely shed a hair anymore! I used to fill up the shower hair catcher every day. Not anymore and I barely get 10 hairs out when combing after showering. No more finding loose hairs on my clothing, office chair, etc.