It is a paraben free serum that gives 6 benefits – controls frizz, smoothens rough ends, protects from humidity, nourishes dry hair, instantly detangles & adds instant shine. Gives perfectly smooth, frizz-free hair for upto 72 hours (when using the system of SMOOTHPROOF shampoo, conditioner and serum vs. a non-conditioning shampoo. Work a small amount of product in hands and apply evenly through damp hair. Blow-dry or style as desired. You can use SMOOTHPROOF 6-1 Serum for deep conditioning, styling, after a haircut, after blow dry, hair color and straightening. It can be reapplied throughout the day for added shine and frizz control.