from what I've read once a hair loses its pigment it's gone and there's nothing you can do. :( There have been cases where color returned IF the loss was due to extreme stress, but if it's due to the normal aging process then there's not much you can do. :( Sorry! Get a physical and make sure your iron levels are where they should be. That's the only thing you can do really in terms of maintaining healthy hair color besides dying it with walnut.