I use this clarifying shampoo once per week and it makes such a huge difference! It removes all the residual product that doesn’t come out with regular shampoo. My hair is left shiny and my curls more bouncy! I started using it after returning from the beach and having some brassy sunscreen discoloration to my normally bright platinum blondes! It fixed them after one use! It’s also rated excellent on the Yuka app LTKFindsUnder50 LTKBeauty