I was using Pureology since it is sulfate free, which is important to me, and it was prolonging the color on my hair but then I came across someone that owns her own business on the web and makes a shampoo for color-treated hair and it's also sulfate free. It also slows down hair shedding and it appears to regrow some hair (not me yet since I've only been using it a short while) in the process so now I use hers (Ari's Home Spa) and it's even less expensive than the other brands I have used.