Restylane® and Perlane® are comprised of Hyaluronic Acid, an injectable agent well suited to correct wrinkles, enhance lips or otherwise augment soft tissue. Hyaluronic Acid may be derived from animal sources (rooster comb) or, as in the case of Restylane® and Perlane®, may be laboratory created. Perlane® is primarily the same product as Restylane®, but Perlane® filler contains a larger concentration of hyaluronic acid. Because of this higher concentration of hyaluronic acid, Perlane® is usually used for larger folds, while Restylane® is better suited for smaller wrinkles or to maintain the results of a previous Perlane® injection.