Suave Professionals Keratin Infusion Smoothing Serum is a light-weight styling serum that can be used on wet or dry hair. Natural keratin protein in hair depletes over time leaving it unmanageable, frizzy and harder to style. This smoothing serum, infused with keratin, seals the hair cuticle to make hair smooth and shiny. Keratin Infusion Smoothing Serum controls frizz for up to 48 hours, fights humidity, and eliminates flyaways. This serum is ideal for those with frizzy and unmanageable hair.