I use this booster to add to the orange kerastase fusio dose bottle (oleo-fusion). It helps reduce frizz and my hair is much softer after using this. I have highlighted/brittle hair, which takes time to flat iron or style. This does help with reducing flat iron/styling time, too. I have noticed that when I flat iron after using this product, it does smooth out hair cowlicks easier causing me to use less heat.