Examine your diet.It's true that meds can make your hair thin, but so does stress and diet. Your doc might not be able to give you a direct answer b/c it could be any number of things. When I was going through a really rough break up, I got real sick really fast, and my hair (which was usually shiny, bouncy and thick) became dull, flat and thin. I wasn't eating very well, but eventually I got my diet back in shape and that's also when I really got into yoga. Make sure you're getting enough calcium, maybe up your olive oil intake. Eat a variety of foods.If you're looking for a shampoo that's really full of fats and vitamins, try something with hemp oil in it. I use Rainshower shampoos and conditioners. They are available at health food stores, Wild Oats or Whole Foods. Debbie23 w/ CF