bought Nexxus Color Assure Shampoo & Conditioner after I dyed my hair pink, in the hopes that it would help preserve my color for as long as possible. It definitely helps keep the pink in my hair & I'm impressed considering colors like mine are very hard to maintain. One thing to remember is that since it's a sulfate-free formula, it has oils that are meant to cleanse the hair without stripping out all of the natural oils, moisture, etc. Because of this, you can get a build-up of oil at your scalp after so many uses of the product. All it takes is a quick wash w/ a different shampoo (I like to use 100% Pure's Honey & Virgin Coconut Restorative Shampoo. It's 100% vegetarian, cruelty free & also contains no sulfates. At $18 for an 8oz bottle, it's a bit more on the expensive side though. That's why I only use it occasionally but I suppose this is turning into another review). Overall, I like the Nexxus Color Assure Shampoo & I like that it uses different ingredients other than sulfates to not only keep color in but to keep moisture in as well.