I received a sample of StiVectin Hair Vibrancy Booster for color treated Hair from Sephora. I followed the instructions and applied after shampoo and conditioner. I left the product in my hair for the instructed amount of time. When I rinsed my hair out it felt like I never used a conditioner at all. My hair felt stripped and even dryer. I have curly hair and my hair is usually on the drier side, but this product just made my hair feel course. I am glad that I just had a sample and had never spent the money on it! Beware!