I have was diagnosed as having Graves Disease in 2002 and was given a pill to shrink my thyroid. So I have been taking Levoxl ever since. I tend to shed a lot and my hair on the sides and nap always seem to grow a little and then break off. I've been taking hair vitamins for over a year to promoe hair growth and strenghten my hair. But I'm not seeing satisfactory results. Is it my medicine or do I need to take a specific vitiamin to reverse the constant breaking of hair? What can do to help my situation???? Im an African American female.