THEINKEYLIST™ Hyaluronic Acid Hydrating Hair Treatment smooths hair. This frizz control serum is suitable for everyone, seriously. Lightweight, it hydrates hair while working to reduce frizz and brittleness. It helps protect hair from environmental pollution and provides a boost of moisture for dry or damaged tresses. It also contains conditioning ingredients such as betaine, leaving tresses feeling healthy, soft, and naturally shiny.