Hyaluronic Acid (Hyaluronic Acid, Sodium Hyaluronate, HA) has many benefits and is one of the most interesting ingredients in skin care, specifically. Naturally found in the body, hyaluronic acid secures moisture and creates fullness—youthful skin naturally abounds with hyaluronic acid. In skin care, you can find hyaluronic acid creams, serums, injectables (aka: Restylane), and hyaluronic acid supplements.