Best for: Taming frizz and tangles Frizz-free in a jiffy! This light, silicone-free formula penetrates each strand to control frizz and flyaways and protect hair from damaging elements during the day. Nourishment by night Use one pump as a leave-on treatment to allow the nutrient-rich plant oils to bring back your hair's natural health as you sleep. Health in, beauty out Most hair serums are silicone-based. But silicone gives hair shine by coating it like cheap plastic, starving it from proper nourishment. Our smoothing serum uses all-natural soybean, broccoli, sunflower and avocado oils - a true feast for your crowning glory.