What Makes Hyaluronic Acid Serum a Hydration Powerhouse When skin looks tired, tight, or textured, the most transformative fix is often the simplest: water. A well-formulated Hyaluronic Acid Serum helps skin hold onto that water where it matters most. Hyaluronic acid (HA) is a stellar humectant—meaning it attracts and binds moisture—capable of drawing up to…